by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo $6.00
by Djoehana Setyamidjaja, M.Ed $6.00
by J. Donald Walters $5.00
by Prof. Dr. M. Mutawalli asy-Sya'rawi $6.00
by B. U. Hadikusumo $5.00
by Taize $6.00
by Muhammad al-Utsaimin $5.00