by - $11.00
by Prof. Dr. Burhanuddin Salam, M.M $7.00
by Prof. Dr. Sukardi, Ph.D $9.00
by Prof. Dr. Suharsimi Arikunto $11.00
by Toelihere, Mozes R & Yuhara Sukra $5.00
by Wirjasantoso, Ratal $7.00
by Hendra Sutardhio $9.00
by Dr. Thomas Gordon $6.00
by Hetifah $20.00