Catling, Christopher, author
Hermes House, 2014
Buku Teks
Young, Arthur, author
Sphere, 1986
Buku Referensi
Lendrum, Tony, author
McGraw-Hill, 1995
Buku Referensi
Olsen, George H., author
Prentice-Hall, 1980
Buku Referensi
Heiserman, David L., author
Prentice-Hall, 1981
Buku Referensi