New-York: Prentice Hall, 1993,
Buku Referensi
Heisler, Sanford I, author
John Wiley & Sons, 1984
Buku Referensi
Lewis, Richard J., author
Wiley-Interscience, 2002
Buku Referensi
editors, Gerald P. Koocher, John C. Norcross, Sam S. Hill, III
Oxford University Press, 2005
Buku Teks
editor, Gerald P. Koocher, John C. Norcross, Sam S. Hill
Oxford University Press, 2005
Buku Referensi