Friedman, Lawrence M., 1930-, author
W.W. Norton, 1984
Buku Teks
Barger, Harold
Chicago: Rand McNally, 1964,
Buku Teks
Faulkner, Harold Underwood
Harper , 1950
Buku Teks
Heck, Harold J.
American Management Association, 1972
Buku Teks
Westwood, John
Donnington Press , 1971
Buku Teks