Swales, John M., author
Cambridge University Press, 2004
Buku Teks
Haslam, Sara, author
Routledge, 2009
Buku Teks
Dawson, Paul, author
Routledge, 2005
Buku Teks
Arp, Thomas R., author
Macmillan, 1966
Buku Teks
Swales, John M., author
Cambridge University Press , 1990
Buku Teks