National Academy Press, 1999
Buku Teks
edited by James F. Phillips, John A. Ross
Clarendon Press, 1992
Buku Teks
Repetto, Robert
John Hopkins University Press , 1979
Buku Teks
edited by Anrudh Jain
Population Council, 1998
Buku Teks
Cuca, Roberto, author
John Hopkins University Press, 1977
Buku Teks