International encyclopedia of the social sciences : volume 15, 16 & 17
edited by David L. Sills
Macmillan and The Free Press, 1968
 Buku Referensi
Investment criteria and economic growth : papers presented at a conference sponsored jointly by the Center for International Studies and the Social Science Research Council, October 15, 16, and 17, 1954
Asia Publishing House , 1964
 Buku Teks
The Encyclopedia Americana : the international reference work, volume 17
Americana Corporation, 1960
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 15
Americana Corporation, 1960
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 16
Americana Corporation, 1960
 Buku Referensi
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