The abbreviations listed below appear throughout this website; all books (listed here with date of first publication and publication details of current editions) are by IB unless otherwise indicated; abbreviations for subsequent editions add the relevant arabic numeral, so that, e.g., RT2 is the 2nd edition of RT; page references are given by plain number, followed after an oblique stroke by the note number if relevant (e.g. AC2 138/1 = Against the Current, 2nd ed., p. 138, note 1)

A Affirming: Letters 1975–1997, ed. Henry Hardy and Mark Pottle (2015: London, Chatto and Windus)
A+ Supplementary letters, 1975–1997, online in IBVL
AC Against the Current: Essays in the History of Ideas, ed. Henry Hardy, introduction by Roger Hausheer (1979), 2nd ed., foreword by Mark Lilla (2013: Princeton, Princeton University Press)
AE The Age of Enlightenment: The Eighteenth-Century Philosophers, selected with introduction and commentary by IB (1956), 2nd ed., ed. Henry Hardy (2017: Oxford, Isaiah Berlin Literary Trust), online in IBVL
B Building: Letters 1960–1975, ed. Henry Hardy and Mark Pottle (2013: London, Chatto and Windus)
B+ Supplementary letters, 1960–1975, online in IBVL
BI Henry Hardy (ed.), The Book of Isaiah: Personal Impressions of Isaiah Berlin (2009: Woodbridge, The Boydell Press in association with Wolfson College, Oxford)
CC Concepts and Categories: Philosophical Essays, ed. Henry Hardy, introduction by Bernard Williams (1978), 2nd. ed., foreword by Alasdair MacIntyre (2013: Princeton, Princeton University Press)
CIB Ramin Jahanbegloo, Conversations with Isaiah Berlin (1991), 2nd ed. (2007: London, Halban)
CTH The Crooked Timber of Humanity: Chapters in the History of Ideas, ed. Henry Hardy (1990), 2nd ed., foreword by John Banville (2013: Princeton, Princeton University Press)
E Enlightening: Letters 1946–1960, ed. Henry Hardy and Jennifer Holmes (2009: London, Chatto and Windus)
E+ Supplementary letters, 1946–1960, online in IBVL
F Flourishing: Letters 19281946, ed. Henry Hardy (2004: London, Chatto & Windus); initially published in the US as Letters 1928–1946 (2004: New York, Cambridge University Press)
F+ Supplementary Letters, 1928–1946, online in IBVL
FEL Four Essays on Liberty (1969), superseded by L
FIB Freedom and its Betrayal: Six Enemies of Human Liberty (1952 lectures), ed. Henry Hardy (2002), 2nd. ed., foreword by Enrique Krauze (2014: Princeton: Princeton University Press)
FL The First and the Last (1999: New York, New York Review Books; London, Granta)
IB Isaiah Berlin
IBVL The Isaiah Berlin Virtual Library
HF The Hedgehog and the Fox: An Essay on Tolstoy’s View of History (1953), 2nd. ed., ed. Henry Hardy, foreword by Michael Ignatieff (2013: Princeton, Princeton University Press)
KM Karl Marx (1939), 5th ed., ed. Henry Hardy, foreword (1978) by Alan Ryan, afterword (2009) and guide to further reading by Terrell Carver (2013: Princeton and Oxford, Princeton University Press)
L Liberty, ed. Henry Hardy, essay on ‘Berlin and His Critics’ by Ian Harris (2002: Oxford and New York, Oxford University Press
OM George Crowder and Henry Hardy (eds), The One and the Many: Reading Isaiah Berlin (2007: Amherst, NY, Prometheus)
MI Michael Ignatieff, Isaiah Berlin: A Life (1998: London, Chatto and Windus; New York, Metropolitan)
MN The Magus of the North: J. G. Hamann and the Origins of Modern Irrationalism, ed. Henry Hardy (1993), superseded by TCE
MSB Oxford, Bodleian Library, MS. Berlin (by shelfmark/folio, e.g. MSB 325/56 = MS. Berlin 325, fo. 56)
PI Personal Impressions, ed. Henry Hardy, introduction by Noel Annan (1980), 3rd ed., foreword by Hermione Lee (2014: Princeton, Princeton University Press)
PIRA Political Ideas in the Romantic Age: Their Rise and Influence on Modern Thought, ed. Henry Hardy, introduction by Joshua L. Cherniss (2006), 2nd. ed. (2014: Princeton, Princeton University Press)
POI The Power of Ideas, ed. Henry Hardy (2000), 2nd. ed., foreword by Avishai Margalit (2013: Princeton, Princeton University Press)
PSM The Proper Study of Mankind: An Anthology of Essays, ed. Henry Hardy and Roger Hausheer, foreword by Noel Annan, introduction by Roger Hausheer (1997), 2nd ed., foreword by Andrew Marr (2014: London, Vintage)
RR The Roots of Romanticism (1965 lectures), ed. Henry Hardy (1999), 2nd. ed., foreword by John Gray (2013: Princeton, Princeton University Press)
RT Russian Thinkers, ed. Henry Hardy and Aileen Kelly, introduction by Aileen Kelly (1978), 2nd ed., revised by Henry Hardy, glossary by Jason Ferrell (2008: London etc., Penguin Classics)
SM The Soviet Mind: Russian Culture under Communism, ed. Henry Hardy, foreword by Strobe Talbott (2004), 2nd ed. (2016: Washington, Brookings Classics, Brookings Institution Press)
SR The Sense of Reality: Studies in Ideas and their History, ed. Henry Hardy, introduction by Patrick Gardiner (1996: London, Chatto and Windus)
TCE Three Critics of the Enlightenment: Vico, Hamann, Herder, ed. Henry Hardy (2000), 2nd. ed., foreword by Jonathan Israel (2013: Princeton, Princeton University Press)
UD Unfinished Dialogue (with Beata Polanowska-Sygulska), foreword by Henry Hardy (2006: New York, Prometheus Books)
VH Vico and Herder: Two Studies in the History of Ideas (1976), superseded by TCE