Buku Teks
Hatcher, Robert A., author
Population Information Program, 2001
Buku Teks
edited by John H. Perry
McGraw-Hill, 1950
Buku Referensi
Baldwin, David A. (David Allen), author
Libraries Unlimited, 2003
Buku Referensi
Munde, Gail, author
Neal-Schuman, 2013
Buku Teks