by $4.00
by A. M. Putut Prabantoro $6.00
by Srivastava. UK., GV. Shenoy, SC. Sharma $11.00
by WK $16.00
by Theo Riyanto, FIC $6.00
by Ir. Abbas Siregar Djarijah $6.00
by Zainal Asikin, dkk $9.00
by Prof. Dr. Soegyarto Mangkuatmodjo $13.00
by Clara Ng $6.00
by $5.00
by Fredy Rangkuti $11.00
by Kartika Rini $7.00