South, Stanley
Academic Press, 1977
Buku Teks
Paludi, Michele A.
Praeger, 2003
Buku Teks
Weinbach, Robert W.
Pearson, 2015
Buku Teks
Borror, Donald J.
Houghton Mifflin, 1976
Buku Referensi
Ballast, David Kent
Professional Publications, Inc., 2002
Buku Referensi