Doff, Adrian, author
Cambridge University Press , 2010
Buku Teks
Huddleston, Rodney, author
Cambridge University Press, 2006
Buku Teks
Ehrlich, Eugene, author
McGraw-Hill , 2011
Buku Teks
Tilbury, Alex, author
Cambridge University Press , 2011
Buku Teks
Marsh, Philip Michael
Grasindo, 2007
Buku Teks