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Reinhold Publishing Corporation, 1964
Buku Teks SO
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The Mona GrOup LLC, 1998
Multimedia
Belk, Collen
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Buku Teks
Belk, Collen
Pearson Prentice Hall, 2007
Multimedia
Branley, Franklyn M.
Ginn and Company, 1965
Buku Teks