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