edited by Stephen J. Williams
John Wiley & Sons, 1980
Buku Teks
Birenbaum, Arnold, author
Allanheld, Osmun, 1981
Buku Teks
edited by Michael Parker
Routledge , 1999
Buku Teks
Burton, Lloyd Edward.
The Williams & Willkins, 1980
Buku Teks
Jaco, E. Gartly
Free Press, 1972
Buku Teks