by Aloys Budi Purnomo, Pr $7.00
by Joko Suyatno, Ig. $4.00
by Prof. Dr. M. Mutawalli asy-Sya'rawi $6.00
by Dr. Ir. Muhammad Rasyaf, MS $7.00
by Herbert Vorgrimler $4.00
by Slamet Soeseno $5.00