by - $9.00
by Swasono, Sri-Edi $7.00
by Prof. Dr. Soegyarto Mangkuatmodjo $13.00
by Prof. Dr. Suharsimi Arikunto $18.00
by Prof. DR. Sukardjo $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00