Indian Institute of Management, 1991
Buku Teks
Ahrens, L.H.
Pergamon Press, 1983
Buku Teks
edited by Merwin M. Hargrove, Ike H. Harrison and Eugene L. Swearingen
Irwin, 1966
Buku Teks
Buchholz, Rogene A.
Prentice-Hall, 1989
Buku Teks
Cochrane, Susan H.
World Bank, 1983
Buku Teks