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Buku Teks
edited by Barry M. Rubin and Elizabeth P. Spiro ; with a foreword by Muriel S. Humphrey
Westview Press, 1979
Buku Teks
McCormick, James M.
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Buku Teks
Herrick, Christopher
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Buku Teks
Langdon, Robert M.
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Buku Teks