Lynton, Rolf P.
Carolina Population Center, University of North Carolina , 1974
Buku Teks
Davis, Elisabeth B.
Marcel Dekker, 1981
Buku Referensi
Longmans, 1966/1967
Buku Teks
by W. D. Borrie [and others]
UNESCO, 1957
Buku Teks
Mijung Kim, C. H. Diong, editors
[Sense, Sense], 2012
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