Beauchamp, Tom L., author
Oxford University Press, 2013
Buku Teks
Beauchamp, Tom L., author
Oxford University Press, 1994
Buku Teks
Veatch, Robert M., author
Oxford University Press, 2015
Buku Teks
Garrett, Thomas M., author
Prentice-Hall, 2001
Buku Teks
Mappes, Thomas A.
McGraw-Hill, 1986
Buku Teks