by Prof. DR. Taliziduhu Ndraha $7.00
by $9.00
by Harry Simons $12.00
by Drs. H. Malayu S.P. Hasibuan $7.00
by Drs. Husein Umar, S.E., M.M., MBA $9.00
by Abdul Rachman $13.00
by Richard Carlson, Ph.D $9.00
by F.W. Dillistone $9.00