edited by George Thomas Kurian
Facts on File, 1982
Buku Referensi
Field Enterprises Educational Corporation, 1963
Buku Referensi
editor in chief, Seymour Martin Lipset
Routledge, 1995
Buku Referensi
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
Buku Referensi
World Book, 1985
Buku Referensi