by Prof. Dr. Suharsimi Arikunto $11.00
by Ollen Burger Terj. Budi Sucahyono $12.00
by dr. Boyke Dian Nugraha $7.00
by Prof. Komaruddin $11.00
by Drs. Hafifi $22.00
by David A. Wise & Mark Malseed $16.00
by Drs. Soemarso, S.R $18.00