by A. Gomes, Kwanchai dan Arturo A. Gomes $12.00
by - $16.00
by Drs. G. Kartasapoetra $12.00
by Lester R. Brown $21.00
by Prof. Dr. Prayitno $9.00
by Julius R. Latumaerissa, S.E., M.M $7.00
by Ir. M. Iqbal Hasan $12.00
by Radiks Purba $12.00
by Ahmad Suaedy $11.00
by Raldi Artono $18.00
by Hindah Muaris $7.00
by - $12.00