Ferguson, Gibson, author
Edinburgh University Press, 2006
Buku Teks
Cooper, Robert L., author
Cambridge University Press, 1989
Buku Teks
Osaka University
Osaka University, 2020
Buku Teks SO
SEAMEO Regional Language Centre, 1983
Buku Referensi
Graduate School of Language and Culture, Osaka University, 2018
Majalah, Jurnal, Buletin