Lawrence, Eleanor
John Wiley & Sons, 1989
Buku Teks
Lawrence, Eleanor
Prentice-Hall, 2000
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edited by Philip Winn
Routledge, 2001
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Henderson, I. F.
Harlow, England Longman Scientific and Technical
Buku Referensi
edited by William Dodge Lewis, Henry Seidel Canby, Thomas Kite Brown
John C. Winston, 1942
Buku Referensi