Millington, T. Alaric, author
Barnes & Noble Books, 1971
Buku Referensi
Glenn, J. A., author
Harper and Row, 1984
Buku Referensi
James, James, author
Van Nostrand Reinhold, 1976
Buku Referensi
edited by David Nelson
Penguin Books, 2003
Buku Referensi
editor in chief, Sybil P. Parker
McGraw-Hill, 1997
Buku Referensi