Thompson, Warren S.
McGraw-Hill, 1970
Buku Teks SO
Thompson, Warren S.
Tata McGraw-Hill, 1965
Buku Teks SO
edited by Jyoti Shankar Singh
Praeger Special Studies, 1979
Buku Teks SO
Population Institute East-West Center, 1987
Majalah, Jurnal, Buletin
Salas, Rafael M.
Pergamon Press , 1977
Buku Teks SO