Friedman, Lawrence M., 1930-, author
Russell Sage Foundation, 1994
Buku Teks
Wang, Lv, author
China Renmin University Press, 2015
eBooks
Pieper, Josef, author
Pantheon Books, 1955
Buku Teks
edited by Milton Fisk
Humanities Press, 1993
Buku Teks
Ross, Alf, author
Stevens & Sons Limited, 1958
Buku Teks