by Sakti A. Siregar $6.00
by Aziz Alimul $7.00
by dr. Santoso Gunardi, MS, PAK $6.00
by Prof. Dr. Suharsimi Arikunto $9.00
by Wiratha $0.00
by Brooks $20.00
by H. Rahmat Rukmana $5.00
by Siswandi, Drs. $8.00