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H. Vetch , 1930
Buku Teks
Sage Publications, 1978
Buku Teks
Henderson, Gordon G.
Harper and Rows, 1976
Buku Teks
contributors, Frederick C. Barghoorn ... [and others] ; edited by Sigmund Neumann
University of Chicago Press, 1956
Buku Teks
Ware, Alan
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Buku Teks