Olsson, Gustaf, author
Prentice-Hall, 1992
Buku Teks
McClure, Carma L., author
Prentice-Hall, 1989
Buku Teks
McClure, Carma L., author
Prentice-Hall, 1989
Buku Teks
Morris, Anne, 1950-, author
Gower, 1998
Buku Teks
Dyer, Hilary, 1954-, author
Gower, 1990
Buku Teks