Fanselow, Gisbert
Tubingen Francke 1987
Buku Teks
edited by S.A. Wurm and D.C. Laycock
Linguistic Circle of Canberra, 1970
Buku Klasik
The Hankes Foundation, 1992
Multimedia
Sharpe, Pamela J.
Barron's Educational Series, 1995
Multimedia
Pyle, Michael A., author
Cliffs, 1995
Multimedia