Puotinen, C.J., author
Holt, Rinehart and Winston, 1983
Buku Teks
Tausworthe, Robert C., author
Prentice-Hall, 1977
Buku Teks
Sterling, T.D., author
Macmillan, 1970
Buku Teks
Hogan, Thom, author
[Publisher not identified], 1981
Buku Teks
Burrus, C. Sidney, author
Paramount Communication Company, 1994
Buku Teks