United Nations Educational, Scientific and Cultural Organization
Unesco, 1971
Buku Referensi
Erlangga Publishers, 1972
Buku Teks
Neng Djubaedah, author
Badan Penerbit FHUI, 2019
Artikel Jurnal
Turk, Jonathan
Soundres College Pub., 1984
Buku Teks
Deliar Noer, author
Equinox Publishing, 2010
Buku Teks