Farmer, R.D.T.
Blackwell Scientific Publ., 1977
Buku Teks
Farmer, R.D.T.
Oxford Blackwell Scientific 1983,
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Labarthe, Darwin R.
Jones & Bartlett Publishers, 2008
Buku Teks
Trostle, James A
Cambridge University Press, 2005
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Rubenstein, David
Original Publishing., 1976
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