Hey, Barbara, author
New Holland, 1994
Buku Teks
Dawn, Hawkins
Oxford University Press, 2009
Buku Teks
Riordan, Jan, author
Mosby, 1983
Buku Teks
Smerdon, Richard, author
Sweet and Maxwel, 2007
Buku Teks
Chambers, Erve, author
Waveland Press, 1989
Buku Teks