by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo $6.00
by Angie Ray $7.00
by Prof. Mr. Dr. Sudargo Gautama, S.H. $7.00
by Lembaga Demografi Fakultas Ekonomi UI $6.53
by Maria A. Sardjono $9.00
by Dripa Sjabana $7.00
