by Prof. Dr. Suharsimi Arikunto $18.00
by Herris B. Simandjuntak $11.00
by Sei H. Dt. Tombak Alam $7.00
by Drs. Suharto, dkk $7.00
by Al Ries, Laura Ries $11.00
by DR. Farida Yusuf Tayibnapis, M.Pd $7.00