United Nations Population Fund; edited by Reed Boland
United Nations Population Fund and Harvard Law School Library , 1986
Buku Teks
UNESCO , 1977
Buku Teks
by United Nations
United Nations, 1993
Buku Teks
Hardaway, Robert M.
Praeger, 1994
Buku Teks
Petersen, William
Macmillan, 1961
Buku Teks