by Dr. Sofyan Syafri Harahap, M.S,Ac $12.00
by Drs. A.W. Widjaja $6.00
by M. Linggar Anggoro $12.00
by Drs. H. Malayu S.P. Hasibuan $11.00
by William J. Goode $9.00
by Richard Nelson-Jone $12.00