edited by Gary Hoover, Alta Campbell, Patrick Spain
The Reference Press, 1991
Buku Referensi
edited by Max M. Russell
Macmillan, 1973
Buku Referensi
Naifeh, Steven, author
Seaview/Putnam, 1983
Buku Teks
Cashman, John R.
Technomic Publishing Company, 1986
Buku Teks
edited by Karen Hill
Gale Research, 1990
Buku Referensi