by WK $16.00
by Sisca Soewitomo $6.25
by Suwarno $7.00
by WK $9.00
by Haryoto $5.00
by WK $12.00
by Edward Aspinnal $9.00
by Prof. Dr. Suharsimi Arikunto $11.00
by Syam Hardy $7.00
by George W. Barclay $7.00
by L. Prasetya, Pr. $4.00
by Murad Wilfred Hoffman $7.00