by $6.00
by Tarwoto $9.00
by WK $12.00
by WK $9.00
by Aziz Alimul $7.00
by Brooks $20.00
by Edward Aspinnal $9.00
by Prof. Dr. Suharsimi Arikunto $11.00
by George W. Barclay $7.00
by L. Prasetya, Pr. $4.00
by Aji Supriyanto $16.00
by Murad Wilfred Hoffman $7.00