Hughes, Fredrick W.
Elex Media Komputindo, 1986
Buku Referensi
Sumur Bandung, 1983
Buku Teks
edited by Byron D. Tapley
John Wiley & Sons, 1990
Buku Referensi
editor, Robert H. Perry
McGraw-Hill, 1976
Buku Referensi
Whitfield, John, author
EPA Press, 1995
Buku Referensi