Andrew A. Fisher, John E. Laing, John E. Stoeckel, John W. Townsend
Population Council, 1998
Buku Referensi
Andrew A. Fisher ...[et al.]
The Population Council, 1998
Buku Teks
The Population Council, 998
Buku Teks
Everest, Suzanne, author
Bailliere Tindall , 1998
Buku Teks
edited by Nancy Loudon
Churchill Livingstone, 1991
Buku Referensi