Folse, Keith S.
Binarupa Aksara Press , 1993
Buku Teks
Shepherd, James F., author
Houghton Miffiln, 1984
Buku Teks
Radlauer, Ruth, author
Bowmar, 1971
Buku Teks
Grellet, Francoise, author
Cambridge University Press, 1994
Buku Referensi
Grellet, Francoise, author
Cambridge University Press, 1981
Buku Teks