David Alistair Watts, author
Artikel Jurnal
Watts, David Alistair, author
Graduate School of Language and Culture, Osaka University, 2019
Artikel Jurnal
Oshima, Alice, author
Pearson Longman, 2006
Buku Teks
Byrd, Patricia, author
Prentice-Hall, 1981
Buku Referensi
Swales, John M.
The University of Michigan Press, 1994
Buku Teks