by Prof. dr. Sarwono Waspadji, Prof. dr. Slamet Suyono $5.00
by Prof. C.J. Ebrahim $6.00
by Aziz Alimul $11.00
by Aziz Alimul $9.00
by Prof. Subowo, dr. M.Sc., Ph.D $7.00
by Aziz Alimul $0.00