Green, Constance McLaughlin, 1897-1975
Harper & Row, Publishers, 1965
Buku Teks
Scott Ian
The John Hopkins University Press , 1982
Buku Teks
Gallion, Arthur B., author
D. Van Nostrand, 1975
Buku Teks
edited by Andrew Blowers, Chris Hammett and Philip Sarre
Hutchinson Educational in association with the Open University Press, 1974
Buku Teks
Gutkind, E. A.
The Free Press of Glencoe, 1963
Buku Teks