by Thompson Ngoen $12.00
by Thabrani, Seno Adjie $9.00
by Agus S. Gunadi $7.00
by Prof. drh. Charles Rangga Tabbu, M.Sc., Ph.D $18.00
by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo $6.00
by Ir. H. Rahmat Rukmana $6.00