Michael, Stephen R.
Techniques of organizational change
McGraw-Hill, 1981
 Buku Teks SO
Kimble, George H.T.
Tropical Africa; Volume 2
Twentieth Century Fund, 1960
 Buku Teks SO
The Power to change: issues for the innovative educator
edited by Carmen M. Culver
McGraw-Hill, 1973
 Buku Teks
Busia,K.A
The challenge of Africa / K. A. Busia
United States of America, 1962
 Buku Teks SO
Kimble, George H.T.
Tropical Africa; Volume 1
Twentieth Century Fund, 1960
 Buku Teks SO