William Wrenall, Quarterman Lee, editors in chief
McGraw-Hill, 1994
Buku Referensi
Welsh, Alexander N.
Pustaka Binaman Pressindom, 1983
Buku Teks
Pergamon Press, 1983
Buku Teks
Leland, Karen
IDG Books Worldwide, 1996
Buku Teks
Bowman, Donald M.
McGraw-Hill , 1963
Buku Teks