Rosenberg, Jerry M., author
McGraw-Hill, 1991
Buku Referensi
Rosenberg, Jerry M., author
McGraw-Hill, 1992
Buku Referensi
Jones, David J., author
Australia, Second Back Row Press
Buku Referensi
Jones, David J.
Second Back Row Press, 1981
Buku Teks SO
Brown, Wendy E., author
McGraw-Hill, 1993
Buku Referensi