Golant, Stephen M., author
John Wiley & Sons, 1979
Buku Teks
Artikel Jurnal
edited by Edward R. Johnson
The Haworth Press, 1988
Buku Teks
Musselman, Vernon A., author
Prentice Hall of India, 1982
Buku Teks
Musselman, Vernon A., author
Prentice-Hall, 1977
Buku Teks