by Lewis Henry Morgan
by Thorstein Veblen
by E. W. (Ernest Watson) Burgess, Robert Ezra Park
by R. R. (Robert Ranulph) Marett
by Charles Horton Cooley
by Émile Durkheim
by Daniel G. (Daniel Garrison) Brinton
by Henry K. (Henry Kalloch) Rowe
by Frank W. (Frank Wilson) Blackmar
by John Dewey
by J. Howard (John Howard) Moore
by Charles A. (Charles Abram) Ellwood
by Ossip Lourié
by Georg Simmel
by William Withington
by John Berry Haycraft
by Ralph Adams Cram
by Georges Palante
by Arthur M. (Arthur Morrow) Lewis