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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
Lewis, Richard J., author
Wiley-Interscience, 2002
Buku Referensi
editor, Gerald P. Koocher, John C. Norcross, Sam S. Hill
Oxford University Press, 2005
Buku Referensi