by Prof. Dr. Suharsimi Arikunto $7.00
by Prof. Dr. Abuddin Nata, MA $9.00
by Bagum A'isyah Bawany $7.00
by Fausiah, Fitri, & Julianti Widury $7.00
by Sotar Baduara & Drs. S. Martin Sirait $6.00
by Abdul Rachman Shaleh $11.00