261
by Habermas, Jürgen
Published 1994
University of Nebraska Press

262
by Du Bois, W. E. B.
Published 1967
Schocken Books

263
by Comte, Auguste
Published 1851
Harper & brothers

264
by Simmel, Georg
Published 1978
Routledge & Kegan Paul

265
by Comte, Auguste
Published 1880
Belford, Clarke & co.

266
by Le Bon, Gustave
Published 1898
Macmillan

267
by Mead, George Herbert
Published 2006
Alexander Street Press