Lanier, Mark M., author
Westview Press, a member of the Perseus Books Group, 2015
Buku Teks
Hogg, Stuart, author
Wiley-Blackwell, 2013
Buku Teks
Ebert, Ronald J., author
Prentice-Hall, 1998
Buku Teks
Bowman, J.H., author
Facet Publishing, 2003
Buku Referensi
Van Ghent, Dorothy, author
Bobbs-Merrill Co., 1965
Buku Teks