Prima Buana Internusa,
Majalah, Jurnal, Buletin
Broun, Hob, author
McGraw-Hill, 1987
Buku Teks
Robinson, Andrew, author
Andre Deutsch, 1990
Buku Teks
Lattimore, Owen, 1900-, author
Capitol Pub. Co. and American Geographical Society, 1951
Buku Teks
Joke Widya, author
Universitas Indonesia, 1975
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