Coontz, Sydney h.
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Buku Teks
Ohlin, Goran
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Buku Teks
Ghosh, Amitav
Ravi Dayal Publisher, 1993
Buku Teks
Sircar, D.C.
Motilal Banarsidass, 1960
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Ness, Gayl D.
The John Hopkins University Press , 1984
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