by Ir. H. Rahmat Rukmana $5.00
by Harahap, Rustam Effendi $6.00
by $18.00
by Pelezar. Michael J. & E.C.S. Chan $11.00
by Drs. Wartono Hadie & Dra. Lies Emmawati Hadie $6.00
by Perserikatan Bangsa-Bangsa $7.00
by Hutabarat, Sahala & Evans, Stewart M $6.00