by Prof. Dr. A. Bari Saifuddin, MPH $6.00
by Aziz Alimul $7.00
by Tarwoto $9.00
by Aziz Alimul $11.00
by Nursalam $12.00
by Prof. Dr. S. Nasution, M.A. $7.00
by V. Lestari $5.00