Donzel, E. Van
E.J. Brill, 1994
Buku Referensi
Heisler, Sanford I
John Wiley & Sons, 1984
Buku Referensi
edited by Andrew Heritage
Dorling Kindersley, 2000
Buku Referensi
Lewis, Richard J.
Wiley-Interscience, 2002
Buku Referensi
editors, Gerald P. Koocher, John C. Norcross, Sam S. Hill, III
Oxford University Press, 2005
Buku Teks