Lewis, Barry
Wadsworth and Cengage Learning, 2013
Buku Teks
Pojman, Louis P.
Wadsworth and Cengage Learning, 2012
Buku Teks
Schinzinger, Roland
McGraw-Hill, 2000
Buku Teks
Lee, Steven P.
Cambridge University Press, 2012
Buku Teks
Gensler, Harry J., 1945-
Routledge, 1998
Buku Teks