Program Pascasarjana Universitas Indonesia, 1994
Majalah, Jurnal, Buletin
Walmsley, D.J., author
Longman, 1993
Buku Teks
Ashford, Jose B, author
Thomson Brooks, 2006
Buku Teks
Canter, David
Buku Teks
Last, John M., 1926-, author
Appleton & Lange, 1998
Buku Teks