De La Salle University Press, 2003
Majalah, Jurnal, Buletin
Center for International Higher Education Boston Collage,
Majalah, Jurnal, Buletin
Ministry of Education & Human Resources Development,
Majalah, Jurnal, Buletin
edited by Frederick Elmer Bolton
Iowa State University Press, 1912
Buku Klasik
Nunn, Sir Percy, author
Edward Arnold, 1949
Buku Teks