Crabbe, Ernest H., author
South-Western Publishing, 1951
Buku Teks
Crabbe, Ernest H., author
South-Western Publishing, 1961
Buku Teks
Lincoln, Edmond E., author
McGraw-Hill, 1941
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Conover, Hobart H.
Allyn and Bacon, 1977
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Griffin, Ricky W., author
Pearson Education International, 2006
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