Hein, Morris, author
"Monterey: Brooks Cole, 1984",
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Hill, John W., author
Upper Saddle RIver Prentice Hall 1997,
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Stapf, Helmut
"Leipzig: Edition, 1967",
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"Pacific Grove: Brooks/Cole Publishing Company, 1998",
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Golden, Sidney, author
"Massachusetts: Addison-Wesley, 1961",
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