Downie, N. M.
Harper & Row, Pub., 1974
Buku Teks
Guenther, William C., author
McGraw-Hill, 1965
Buku Teks
Wetherill, G. Barrie
Chapman & Hall, 1972
Buku Teks
Bachman, Ronet, author
McGraw-Hill, 2008
Buku Teks
Ott, Lyman, author
Duxbury Press, 1993
Buku Teks