by Paul M. Taylor Dp. M;
$12.00

by Drs. M. Taufan
$6.00

by Budi Santoso
$6.00

by Adzimattinur Siregar
$6.00

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

by K.H.D. Zawawi Imron
$6.00