Grampp, William D.
Richard D. Irwin , 1953
Buku Teks
edited by, Michael D. McGinnis
University of Michigan Press, 1999
Buku Teks
Buku Teks
Cohen, Bernard Cecil, 1926-
Princeton University Press, 1957
Buku Teks
edited by Gilbert Rozman
Palgave Macmillan, 2013
Buku Teks