Voice of America Forum Lectures , 1968
Buku Teks
edited Harold J. Berman
A Vintage Book, 1961
Buku Teks
Dyere, Everett D., author
McGraw-Hill, 1979
Buku Teks
National Council of Farmer Cooperatives , 1992
Buku Teks
Makkai, Adam
Barrons, 1995
Buku Teks