by Prof. Dr. Suharsimi Arikunto $11.00
by Drs. H. Inu Kencana Syafiie, M.Si $9.00
by Erwan Juhara $6.00
by Agus Tomin $19.12
by Drs. Harjanto $9.00
by Jo Condrill & Bennie B., Ph.D $7.00
by Bungaran Antonius Simanjuntak $16.00