Whitten, D.G.A., 1921-, author
Victoria Penguin Books 1972,
Buku Referensi
Saussy, George Stone, author
Penguin Books, 1986
Buku Referensi
Fleming, John, author
Penguin , 1999
Buku Referensi
Cohen, J.M. (John Michael), 1903-1989, author
Viking, 1993
Buku Referensi
Mandell, Judy
John Wiley & Sons, Inc.q1996, 1996
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