by Dr. H. Pidyarto Gunawan, O.Carm $4.00
by Dr. Zakiah Daradjat, dkk $7.00
by Prof. Abdur Rahman I Do'I, Ph.D $7.00
by Hasan Muhammad Ayub $6.00
by N. Edy Soetanto, BE. $5.00
by Dr. Niels Mulder $11.00