Mckee, Elmore M.
Washington Square Press, 1960
Buku Teks
Cruickshank, Donald R.
McGraw-Hill, 2012
Buku Teks
Haslam, Sara
Routledge, 2009
Buku Teks
McQuade, Donald
Alfred A. Knopf, 1983
Buku Teks
Gelb, Ignace Jay
The University of Chicago , 1963
Buku Teks