by Lerbin R. Aritonang R. $9.00
by Drs. Husein Umar, S.E., M.M., MBA $13.00
by Rai Wijaya $7.00
by Kwik Kian Gie $6.00
by Michael LeBoeuf, Ph.D $11.00
by Drs. H.M. Yacob Ibrahim $11.00