Galvin, Kathleen M.
National Textbook Company, 1994
Buku Teks
Sandford, William Phillips
McGraw-Hill, 1960
Buku Teks
Ellingsworth, Huber W., author
Prentice-Hall, 1967
Buku Teks
Stevens, Leonard A.
McGraw-Hill, 1966
Buku Teks
Dean, John J.
Boolarong Publications, 1987
Buku Teks