Cambridge University Press, 2004
Buku Teks
Behn, Robert D., author
Basic Books, 1982
Buku Teks
Halter, Albert N., 1927-, author
South-Western Publishing, 1971
Buku Teks
Hogart, Robin M
John Wiley, 1994
Buku Teks
White, D. J.
North-Holland Publishing Company, 1976
Buku Teks