Hunsaker, Phillip L.
A Touchstone Book, 1986
Buku Teks
Giesecke, Joan
[American Library association, American Library association], 2001
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Honey, Peter
McGraw-Hill, 1980
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Beach, Dale S.
Macmillan, 1980
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Hepner, Harry W.
Prentice-Hall, 1961
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