by John L. Espostio $11.00
by Pandji Anoraga, S.E, M.M $6.00
by Ir. M. Najib, M.Sc., et al $7.00
by Dr. H. Abuddin Nata, MA $7.00
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by Th. Aq. M. Rochadi Widagdo, Pr. $6.00