by - $6.00
by P. Dori Wuwur Hendrikus, SVD $9.00
by Cherie Carter-Scott, Ph.D $9.00
by Dr. Pradana Soewondo, SpPD-KEMD $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Doni Istyanto Hari $2.40