by Victor Lazarro $12.00
by Drs. Save M. Dagun $6.00
by Drs. Rohadi Abdul Fatah $7.00
by PK Poerwantana $9.00
by Prof. Dr. Suharsimi Arikunto $6.00
by Prof. Dr. Prijono Tjiptoherjanto $6.00
by Marilyn Gustin $6.00