Copi, Irving M.
Macmillan, 1961
Buku Teks SO
Gower, Barry
Routledge, 1997
Buku Teks SO
Kahane, Howard
1999
Multimedia
Hurley, Patrick J., 1883-1963
Wardsworth Cengage Learning, 2012
Buku Teks SO
Hurley, Patrick J., 1883-1963
Wadsworth and Cengage Learning, 2012
Buku Teks SO