edited by Michael Bowman and Catherine Redgwell
Kluwer Law International, 1996
Buku Teks
Spellerberg, Ian F.
Cambridge University Press, 1992
Buku Teks
Island Press, 1993
Buku Teks
Kantor Menteri Negara Kependudukan dan Lingkungan Hidup, 1992
Buku Referensi
edited by Michael E. Soule
Sinauer Associates, 1986
Buku Teks