Crawford, James
Cambridge University Press, 2014
Buku Teks
Walker, Lynne
McGraw-Hill, 2010
Buku Teks
Kaplan, Norman M., 1931-
Martin Dunitz Press, 2001
Buku Teks
edited by Muir Gray and Godfrey Fowler
Oxford University Press, 1983
Buku Teks
Spiro, Herbert J., editor
Van Nostrand Reinhold, 1969
Buku Teks