by Elizabeth E. Graves $12.00
by Yayori Matsui $21.00
by Prof. Ir. Zoer'ani Djamal Irwan, M.Sc $7.00
by $12.00
by $7.00
by $9.00
by Prof. Mr. Dr. Sudargo Gautama $6.00
by Prof. Dr. Suharsimi Arikunto $9.00
by Donald A. Chu, Ph.D $6.00
by $6.00
by Redaksi (Penghimpun) $6.00
by Prof. dr. H. Sidarta Ilyas, SpM $9.00