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