by Dr. Zakiah Daradjat, dkk $7.00
by Wirjasantoso, Ratal $7.00
by Fina Af'ldatussofa, dkk $6.00
by FMIPA Universitas Indonesia $6.00
by FAO $6.00
by Prof. Dr. S. Nasution, M.A. $7.00
by Prof. Mr. Dr. Sudargo Gautama & Rizawanto Winata, S.H. $7.00