Thompson, Bruce, author
APA, 2004
Buku Teks
Erickson, Bonnie H., author
Open University Press, 1977
Buku Teks
Thomson, William Tyrrell, author
Prentice-Hall, 1979
Buku Teks
Thomson, William Tyrrell, author
Prentice-Hall, 1982
Buku Teks
Thomson, William Tyrrell
Prentice-Hall, 1988
Buku Teks