Oswald Hanfling
Julius Rudolph Weinberg
Dmitry A. Leontiev
Richard Congreve
Auguste Comte
Francesco Barone
Suzann Pileggi Pawelski MAPP
John McTaggart
Scott J. Shapiro
Ellis, Henry positivist
Robert P. George
John Henry Bridges
E. Rosemarie Widmaier
A. J. Ayer
Unknown Author
Michael R. Gottfredson
Roy Wood Sellars
Vernon Lushington