by Abdul Rachman Shaleh $11.00
by Prof. Anas Sudijono $12.00
by Y.B. Mangunwijaya $11.00
by Lyle W. Morgan II, Ph.D., HMD $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Drs. Paulus Hariyono, M.T $9.00
by Prof. Dr. Suharsimi Arikunto $9.00