Artikel Jurnal
edited by Anthony Hopwood and Cyril Tomkins
Philip Allan, 1984
Buku Teks
Journal of Population Vol. 3 No. 3 1997 : 237-268, 1997
Artikel Jurnal
edtied by Anastasia Strati, Maria Gavouneli, Nikolaos Skourtos
Martinus Nijhoff Publishers, 2006
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OPEC Fund for International Development, 1990
Buku Teks