by Prof. Dr. Suharsimi Arikunto $7.00
by Nazir Makarim Syirazi $6.00
by Kh. Athian Ali $7.00
by Dr. Hamzah B. Uno, M.Pd $0.00
by Prof. Dr. S. Nasution, M.A. $9.00
by Ibrahim Muhammad Jamal $7.00