IB's contributions to a conference at the LSE, 19–21 May 1967, held under the title ‘To Define Populism’

• A published summary of the proceedings is in Government and Opposition 3 no. 2 (1968), 137–79, where IB's contributions are at 140, 173–8: see Bib.111(b)(ii)
• A complete transcript of the proceedings of the conference, including more material by IB, is in the library of the LSE under the title ‘London School of Economics Conference on Populism, May 20–21, 1967: Verbatim report’, shelfmark HN 17 C74