by Prof. Dr. Oemar Hamalik $7.00
by Dr. Dukut Respati Kastomo $11.00
by Dr. W. Herdin Sibuea $11.00
by Brooks $18.00
by Nursalam $7.00
by Drs. H. Moh. Pabundu Tika, M.M $7.00
by Kodeks Tchacos $18.00