Ellis, Robert
Harcourt Brace Javanovich, 1978
Buku Teks
Boddy, Michael
Sydney, Currency Press, 1974
Buku Teks
London Collier-Macmillan 1965,
Buku Teks
Fred Genesee, Kathryn Lindholm-Leary, William M. Saunders, Donna Christian
Cambridge University Press, 2008
Buku Teks
Farrell, Thomas S.C.
Corwin Press, 2006
Buku Teks