by Dr. Mien A. Rifai., dkk $11.00
by Dr. Sofyan Syafri Harahap, M.S,Ac $12.00
by JAMES A. JOSEPH, PH.D $7.00
by Dr. B. Siswanto Sastrohadiwiryo $9.00
by ADIL SA'DI $8.00
by Lilyana $9.00
by Masagung $5.00