Barbara Kroll, editor
Cambridge University Press, 2003
Buku Teks
edited by James Flood, Julie M. Jensen, Diane Lapp, James R. Squire
Macmillan, 1991
Buku Referensi
Bonset, Helge
Coutinho, 1992
Buku Teks
Thornton, Geoffrey
Edward Arnold, 1980
Buku Teks
Isbell, Rebecca T.
Wadsworth and Cengage Learning, 2013
Buku Teks