Daniel J. Lathrope, editor
West Group, 2003
Buku Teks
Hardin, Garrett
W.H. Freeman, 1969
Buku Teks
Weeks, John R. (John Robert), 1944-, author
Cengage Learning, 2016
Buku Teks
The John Hopkins University Press , 1965
Buku Teks
Kim, Taek Il
Population Council, 1972
Buku Teks