Artikel Jurnal
Buranapatana, Maliwan, author
Graduate School of Language and Culture, Osaka University, 2019
Artikel Jurnal
Longman, 1995
Buku Teks
Casanave, Christine Pearson
Prentice-Hall, 1986
Buku Teks
edited by Susan E. Israel, Gerald G. Duffy
Routledge, 2009
Buku Referensi