by Prof. Dr. Suharsimi Arikunto $13.00
by Lismidar, H. $5.00
by Amien, Mohamad Miska $5.00
by Dra. Hj. Etin Solihatin, M.Pd, Rahardjo, S.Pd $7.00
by Lindholm, Richard W & Hartojo Wignjowijoto $7.00
by Slameto $9.00