Walker, Rodger
An Arbor Science, 1972
Buku Teks
edited by Stanley Cohen
McGraw-Hill, 1982
Buku Referensi
Tomczak, Steven P.
John Wiley & Sons, 1982
Buku Teks
Willems, Nicholas, author
McGraw-Hill, 1978
Buku Teks
Dowrick, D. J., author
John Wiley & Sons, 1977
Buku Referensi