by Prof. Dr. Sondang P. Siagian, M.P.A
$7.00

by Henry Simamora, S.E
$18.00

by Sulistyowati Irianto, Lim Sing Meij, Firliana Purwanti
$9.00

by Kamaruddin Ahmad., S.E
$9.00

by Drs. Agus M. Hardjana, M.Sc., Ed
$5.00

by Prof. Dr. dr. Wimpie Pangkahila
$7.00