Ministry of Education, 1994
Buku Teks
edited by Leo Goedegebuure ... [and others]
Pergamon Press, 1994
Buku Teks
editors: Grant Harman
UNESCO, 1991
Buku Teks
Kaul, Rekha
Sage Publications, 1993
Buku Teks
Deane E. Neubauer, editor
Routledge, 2012
Buku Teks