OConnor, Frederick H.
Express yourself in written english
National Textbook Company, 1990
Buku Referensi
Bex, Tony
Variety in written english. Texts in society : societies in text
Routledge , 1996
Buku Teks
Yogyakarta : Insight pocket guide / written by Joan Suyenaga
Hofer Press, 1991
Buku Teks
The written assignment : a guide to the writing and presentation of assignments
edited by Di Lewis
Queensland University of Technology, 1999
Buku Teks
Written
Buku Teks