by Dr. Sofyan Syafri Harahap, M.S,Ac $12.00
by Drs. H. Malayu S.P. Hasibuan $7.00
by Prof. Dr. Soegyarto Mangkuatmodjo $13.00
by K. Usman $6.00
by Dr. Ibrahim Bafadal, M.Pd $6.00
by Drs. Soemarso, S.R $7.00
by Gunawan Widjaja & Kartini Mulyadi $9.00
by Abdul Wahhab Khallaf $9.00
by Ira Latief $9.00