by Drs. Amin Widjaja Tunggal, Ak., M.B.A $11.00
by Drs. Soemarso, S.R., dkk $6.00
by Wildan Suyuthi Mustafa $13.00
by - $6.00
by Prof. Dr. Suharsimi Arikunto $13.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00