McMillon, Bill, author
John Wiley & Sons, 1991
Buku Referensi
South, Stanley
Academic Press, 1977
Buku Teks
Paludi, Michele A., author
Praeger, 2003
Buku Teks
Weinbach, Robert W., author
Pearson, 2015
Buku Teks
Borror, Donald J., author
Houghton Mifflin, 1976
Buku Referensi