Kwak, Duck-Joo
Springer, 2012
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Hammersley, Martyn, author
Paul Chapman Publishing, 2002
Buku Teks
Slavin, Robert E., author
Paramount Publishing, 1994
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Hoy, Wayne K., author
Random House , 1978
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Hoy, Wayne K., author
McGraw-Hill, 2013
Buku Teks