by Prof. Dr. Sondang P. Siagian, M.P.A
$9.00

by Jack Trout dan Steven Rivkin
$6.00

by A. Gomes, Kwanchai dan Arturo A. Gomes
$12.00

by -
$12.00

by Leo Suryadinata
$4.61

by Dr. Sofyan Syafri Harahap, M.S,Ac
$7.00