Berko, Roy M
Houghton Miffiln, 2001
Buku Teks
edited by D.H. Mellor
Cambridge University Press, 1990
Buku Teks SO
Adler, Ronald Brian, 1946-
McGraw-Hill, 2005
Multimedia
Phillips, Gerald M.
Macmillan, 1982
Buku Teks
Adler, Ronald Brian, 1946-
McGraw-Hill, 2002
Multimedia