by Supranto, J. $7.00
by Johannes Lim, Ph.D., CPC $11.00
by Drs. Sofwan Badri $6.00
by Lembaga Demografi Fakultas Ekonomi UI $6.53
by Muridian S. Widjojo $17.00
by Drs. Zifirdaus Adnan & Dra. I. Zifirdaus $9.00