edited by Robert Kennedy and John M. Weinstein
Westview Press, 1984
Buku Teks
Bower, Joseph L., author
Harvard Business School Press, 1972
Buku Teks
[publisher not identified], 1957
Buku Teks
edited by Egbert De Vries, Jose Medina Echavarria
UNESCO, 1967
Buku Teks
Echavarria, Jose Medina, author
New York, N.Y., Unesco
Buku Teks