Walker, Theodore D., author
Van Nostrand Reinhold,, 1990
Buku Teks
Church, Thomas D.
McGraw-Hill, 1985
Buku Teks
Tanner, Ogden., author
Time-Life Books, 1978.
Buku Referensi
Murphy, Wendy B., author
Time-Life Books, 1978
Buku Referensi
Austin, Richard L., author
Van Nostrand Reinhold, 1983
Buku Teks