Kantor Menteri Negara Kependudukan dan Lingkungan Hidup, 1992
Buku Referensi
edited by Michael Bowman and Catherine Redgwell
Kluwer Law International, 1996
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Katrina Brown ... [et al.]
The Global Environment Facility, 1993
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Salyers, Abigail A.
Fitzgerald Science Press , 2001
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Dolphin, Warren D.
McGraw-HIll, 2002
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