Brand, Norman, author
St. Martin's Press, 1994
Buku Teks
Simons, Herbert W., author
Randon House, 1976
Buku Teks
Simons, Herbert W., author
Randon House, 1976
Buku Teks
Bertrand, Jane T.
University of Chicago, 1978
Buku Teks
Jane's Information Group, 1999
Buku Referensi