Weilbacher, William M
Macmillan, 1979
Buku Teks
Lane, W. Ronald, author
New York, 2000
Buku Teks
Ahuja, B. N., author
Surjeet Publications, 1989
Buku Teks
Moriarty, Sandra E. (Sandra Ernst), author
Kencana, 2011
Buku Teks
Crawford, John W., author
Allyn and Bacon, 1965
Buku Teks