by - $12.00
by - $9.00
by Drs. Thohir Luth, M.A., dkk $6.00
by Prijono Tjiptoherijanto, S.E, M.A, Ph.D $7.00
by Dr. W. Herdin Sibuea $11.00
by Dr. Mien A. Rifai., dkk $11.00