by W.A.R. Thomson $6.00
by Deliarnov $11.00
by Prof. Dr. dr. Sarwono Waspadji, SpPD-KEMD $7.00
by Asmaran AS $7.00
by Dra. Sri Sundari HS., M.Pd $6.00
by Dr. W. Herdin Sibuea., dkk $7.00