Population Institute East-West Center, 1987
Majalah, Jurnal, Buletin
edited by Jyoti Shankar Singh
Praeger Special Studies, 1979
Buku Teks
Agarwala, S.N.
Tata McGraw-Hill, 1977
Buku Teks
Salas, Rafael M.
Pergamon Press , 1977
Buku Teks
American Association for the Advancement of Science, 1975
Buku Teks