Paine, Thomas
Thomas Paine Foundation, 1950
Buku Teks SO
Reichenbach, Hans
University of California Press, 1968
Buku Teks SO
edited by Ernst Cassirer; Paul Oskar Kristeller; John Herman Randall
University of Chicago Press, 1948
Buku Teks SO
Ewing, J.H.
Student Outline Co. , 1960
Buku Teks
Thibault, Paul J.
Routledge, 1997
Buku Teks