Stumpf, Samuel Enoch, 1918-1998, author
McGraw-Hill, 1971
Buku Teks
edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
Buku Teks
Pojman, Louis P., author
Thomson Wadsworth, 2006
Buku Teks
Goldman, Alvin I., author
MIT Press, 1993
Buku Teks
Pisarev, Dmitry, author
Foreign Languages Publishing House, 1958
Buku Teks