by Drs. Husein Umar, S.E., M.M., MBA $7.00
by Swasono, Sri-Edi $7.00
by Oka A. Yoeti $11.00
by David A. Wise & Mark Malseed $16.00
by - $7.00
by Prof. DR. S.P. Siagian, M.P.A $9.00