Brandes, Joseph
University of Pittsburgh Press, 1962
Buku Teks
Magdoff, Harry, author
Modern Reader Paperbacks, 1969
Buku Teks
Hayes, Margaret Daly, author
Westview Press, 1984
Buku Teks
Choate, Pat.
Business Books, 1990.
Buku Teks
Andrerson, James E., author
Addison-Wesley, 1970
Buku Teks