Wills, Pauline
Headway , 1994
Buku Teks
Mennell, Robert L., author
West Publishing, 1994
Buku Teks
edited by Susan Davies
Melbourne University Press, 1996
Buku Teks
Ettlin, Richard A
The University of chicago press, 1994
Buku Teks
edited by Frances Farmer
Oceana, 1956
Buku Teks