by WK $12.00
by Prof. Dr. Umar Tirtarahardja dan Drs. La Sula $12.00
by Ir. Heinz Frick & Pujo L. Setiawan $7.00
by W. James Popham $7.00
by Drs. Djalinus Syah., dkk $11.00
by $26.00