Gould, Alan, author
Angus & Robertson , 1986
Buku Teks
Augustin, Sally, author
John & Sons, Inc, 2009
Buku Teks
Boom, Coorie ten, author
Bantam Books, 1971
Buku Teks
Larson, James A., author
Prentice-Hall, 1992
Buku Teks
John Wiley & Sons, 2007
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