Wiger, Donald E., author
John Wiley & Sons,Inc., 2003
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Stern, Philip Van Doren
Fawcett Publications, 1961
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Sahela Sabila, author
2020
UI - Tesis (Membership)
Rowman & Littlefield Publishers, Inc., 1998
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Fox, Gregory H., author
Cambridge university press, 2008
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