Spero, Joan Edelman, author
Routledge , 1997
Buku Teks
Reynolds, P.A., author
Longman, 1994
Buku Teks
by J. Swiericzuk ... [and others]
Pitman, 1980
Buku Teks
edited by William T.R. Fox
Indiana University of Notre Dame Press , 1959
Buku Teks
edited by Andrew Gyorgy and Hubert S. Gibbs
Prentice-Hall, 1955
Buku Teks