by Eddy Tano, Dipl. Chem. Eng. $9.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by Drs. Agus Sujanto $7.00
by H. Riduan Syahrani, S.H. $7.00
by Leden Marpaung, S. H. $7.00
by Drs. Domi C. Matutina $12.00
by Djoko Prakoso, S.H $7.00
by Drs. Muhammad Musa asy-Syarif $6.00
by Yasa Boga $13.00
by - $12.00
by - $16.00
by Antonio Cassese $8.00