Henderson, I. F., author
Harlow, England Longman Scientific and Technical
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Lawrence, Eleanor
John Wiley & Sons, 1989
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Lawrence, Eleanor
Prentice-Hall, 2000
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Gramedia Pustaka Utama, 2005
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Soothill, W.E. (William Edward), author
Motilal Banarsidass Publishers Private Limites, 1937
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