by Ir. Rustam Hakim, M.T., IALI $9.00
by Dr. Sofyan Syafri Harahap, M.S,Ac $12.00
by $16.00
by Dr. Juraid Abdul Latief, M.Hum $7.00
by Drs. H. Moh. Pabundu Tika, M.M $7.00
by Fina Af'ldatussofa, dkk $6.00