Berger, Morroe, author
D. Van Nostrand, 1954
Buku Teks
Oceana Publications, Inc., 1964
Buku Teks
Markus, Thomas A.
Routledge, 1993
Buku Teks
Wessel, Milton R., author
Addison-Wesley, 1974
Buku Teks
compiled and edited by Harold Shepherd and Byron D. Sher
Foundation Press, 1960
Buku Teks