Mealey, George A.
Grasberg : mining the richest and most remote deposit of copper and gold in the world, in the mountains of Irian Jaya, Indonesia
Freeport-McMoran Copper & Gold, 1996
 Buku Teks
Newman, Arnold
Tropical rainforest : a world survey of our most valuable and endangered habitat with a blueprint for its survival / Arnold Newman
Fact on File, 1990
 Buku Teks
Science and the endangered species act
Washington National Academy Press , 1995
 Buku Teks
Austin, Peter K., editor
The Cambridge handbook of endangered languages
Cambridge University Press, 2011
 eBooks
Encyclopedia of endangered species
edited by Mary Emanoil
Gale Research Inc., 1994
 Buku Referensi