by Dra. M. Sri Sulastri Rifai, M.Pd $6.00
by Aziz Alimul $11.00
by Nursalam $7.00
by Aziz Alimul $7.00
by Dr. W. Herdin Sibuea $11.00
by Dr. H. Hamzah B. Uno, M.Pd $7.00