by Prof. Ir. Amris Makmur $6.00
by Coen Reijntjes, Bertus Haverkort & Ann Waters-Bayer $18.00
by G. Siregar, Laksmi $6.00
by Amien, Mohamad Miska $5.00
by $7.00
by Djoehana Setyamidjaja, M.Ed $7.00