Mouton, Jane S., author
Hague, 1968
Buku Teks
Forcese, Dennis P., author
Prentice-Hall, 1973
Buku Teks
Standford University Press, 1996
Buku Teks
Pratt Vernon
Methuen Press, 1978
Buku Teks
Junker, Buford H., author
University of Chicago Press, 1960
Buku Teks