Roy, Gabrielle, author
McClelland and Stewart, 1979
Buku Teks
Husain, S.K.
Oxford & IBH Publishing Co., 1982
Buku Teks
edited by Ralph W. Hale
Simon & Schuster, 1986
Buku Teks
Davis, Mackenzie Leo, 1941-, author
Mc Graw Hill, 2011
Buku Teks
Zentner, Matthew, author
Springer, 2012
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