Claybroock, Billy G., author
John Wiley & Sons, 1983
Buku Teks
Finch, Frank, author
Fac On File Publications, 1985
Buku Referensi
Silverberg, Israel, author
Prentice-Hall, 1992
Buku Teks
Johnson, Leroy F., author
Prentice-Hall, 1981
Buku Teks
Glossbrenner, Alfred, author
McGraw-Hill, 1993
Buku Teks