Donzel, E. Van, author
E.J. Brill, 1994
Buku Referensi
New-York: Prentice Hall, 1993,
Buku Referensi
Heisler, Sanford I, author
John Wiley & Sons, 1984
Buku Referensi
editors, Gerald P. Koocher, John C. Norcross, Sam S. Hill, III.
Oxford University Press, 2005
Buku Teks
edited by Andrew Heritage
Dorling Kindersley, 2000
Buku Referensi