Beale, Geoffrey
University Park, 1978
Buku Teks
Simson, Graeme
Simon & Schuster Paperback, 2014
Buku Teks
Waldholz, Michael
Simon & Schuster , 1997
Buku Teks
Meneely, Philip
Oxford Univesity Press, 2009
Buku Teks
DeJong-Lambert, William
Springer, 2012
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