by Drs. Suwarno $7.00
by Dra. Nurul Zuriah, M.Si $11.00
by Donald A. Chu, Ph.D $6.00
by Sofyan Syafri Harahap $7.00
by H.A. Djazauli & I. Nurol Aen $7.00
by Dr. H. Abuddin Nata, MA $7.00