Levy, Michael, 1950-
Cambridge University Press, 2016
Buku Teks
Norton, Donna E.
Merril; A Bell and Howell Information, 1987
Buku Teks
edited by Louis G. Locke, William M. Gibson, George Arms
Holt, Rinehart and Winston, 1959
Buku Teks
London Routledge , 1992
Buku Teks
by Jacquelyn Sanders ... [and others]
The University of Chicago , 1968
Buku Teks