Austin, Peter K., editor
The Cambridge handbook of endangered languages
Cambridge University Press, 2011
 eBooks
Evans, Nicholas
Dying words : endangered languages and what they have to tell us
Wiley-Blackwell, 2010
 Buku Teks SO
Science and the endangered species act
Washington National Academy Press , 1995
 Buku Teks
Encyclopedia of endangered species
edited by Mary Emanoil
Gale Research Inc., 1994
 Buku Referensi
Priebe, Mac
The peregrine falcon : endangered no more
Mindfull Publishing, 2000
 Buku Referensi