by Gunawan Widjaja & Kartini Mulyadi $7.00
by Prof. Dr. Umar Fahmi Achmadi, M.P.H., Ph.D $9.00
by M.L. Jhingan $13.00
by Aziz Alimul $11.00
by Aziz Alimul $7.00
by M. Ali Hasan $5.00