Paul H. Elwood, Jeremy B. Albertus, editor
Nova Science Publisher, 2008
Buku Teks
Fowler, Robert Booth, author
Praeger, 1985
Buku Teks
Anderson, Charles W., 1934-, author
Prentice-Hall, 1967
Buku Teks
edited by Philip John Davies and Fredric A. Waldstein
Manchester University Press, 1987
Buku Teks
Aiken, Tonia Dandry
F.A. Davis , 2004
Buku Teks