by John M. Ortiz, Ph.D. $9.00
by Sei H. Dt. Tombak Alam $13.00
by Najib Khalid al-Amir $7.00
by Dr. Ir. Adji Sastrosupadi, MS $11.00
by Drs. Al. Soenarto S.W., dkk $4.00
by Ibnu Basyar $5.00
by DR. Soekidjo Notoatmodjo $7.00