Wormer, Katherine Stuart van, author
Oxford University Press, 2017
Buku Teks
Hayes, Nicky, author
Macmillan Press, 1995
Buku Teks
Baron, Robert A., author
Allyn and Bacon, 1987
Buku Teks
Baron, Robert A., author
Allyn and Bacon, 1994
Buku Teks
Lopreato, Joseph, author
Allen & Unwin , 1984
Buku Teks