Center for International Higher Education Boston Collage,
Majalah, Jurnal, Buletin
edited by Leo Goedegebuure ... [and others]
Pergamon Press, 1994
Buku Teks
Universitas Indonesia, 2005
Multimedia
UNESCO, 1978
Buku Teks
edited by William H. Allaway
Westview Press, 1985
Buku Teks