Umland, Jean B., author
St. Paul West, 1993
Buku Teks
Umland, Jean B., author
Brooks/Cole, 1999
Buku Teks
Paul, Martin A., author
Harcourt, Brace & World, 1967
Buku Teks
Murov, Steven L., author
Thomson, Brooks/Cole, 2007
Buku Teks
Brady, James E., author
John Wiley & Sons, 1978
Buku Teks