by Prianto & Fritz $30.00
by Aziz Alimul $9.00
by Ir. Arif Hartoyo, M. S $5.00
by Dra. M. Sri Sulastri Rifai, M.Pd $6.00
by Dr. W. Herdin Sibuea., dkk $7.00
by Katzung $26.00