Swales, John M.
The University of Michigan Press, 1994
Buku Teks
Weigle, Sara Chusing
Cambridge University Press, 2002
Buku Teks
Macleride, Sean, author
Balai Pustaka, 1983
Buku Teks
Haynes, W. Warren (William Warren), 1921-1972, author
PRENTOCE-HALL, Inc, Englewood Clifts, 1969
Buku Teks
Fitagerald, Hiram E
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Buku Teks