by Dr. Kathy MacKinnon $20.00
by Ambarini $16.00
by RENNY YANIAR $6.00
by Drs. Heryando Palar, Drs. Asman Riald $12.00
by Wahyuni Mulyawati & Ilse Harahap $7.00
by Prof. Dr. Makmur, M.Si $7.00