Lovelock, Christopher H., author
Prentice-Hall, 2005
Buku Teks
Weingand, Darlene E., author
Libraries Unlimited, 1999
Buku Teks
Saez, Eileen Elliott de, author
Facet, 2002
Buku Teks
Saez, Eileen Elliott de, author
Facet Pub, 2002
Buku Teks
Grede, Robert, author
Interaksa, 2002
Buku Teks