Koocher, Gerald P., author
Oxford University Press, 1998
Buku Teks
Velasquez, Manuel G., author
Pearson, 2006
Buku Teks
Mintz, Steven M., author
McGraw-Hill, 1990
Buku Teks
Velasquez, Manuel G
Prentice-Hall, 2002
Buku Teks
Velasquez, Manuel G., author
Pearson, 2014
Buku Teks