by Prof. Dr. Suharsimi Arikunto $7.00
by Prof. Dr. Sukardi, Ph.D $9.00
by Bharati Mukherjee $7.00
by Muhaimin $9.00
by Asep Burhanuddin $7.00
by Andree Feilard $11.00
by Ernest Dichter $9.00
by Asmoro Akhmadi $6.00
by Machfud Ihsan $5.00
by Tim Redaksi Tatanusa, H. Suraji, SH. & Pularjono $30.00
by Mariasusai Dhavamony $11.00
by D. W. Bowett, QCLLD $16.00