edited by P. McConvell and N. Evans
Oxford University Press, 1997
Buku Teks
Kelly, Robert L.,author
Wadsworth, 2010
Buku Teks
edited by Mari Pritchard Parker, Elvio Angeloni
McGraw-Hill, 2013
Buku Teks
SPAFA, 1984
Buku Referensi
Crawford, R.M.
Hutchinson's University Library, 1955
Buku Teks