by Drs. Robinson Tarigan $9.00
by Prof. Mr. Roeslan Saleh $7.00
by Drs. Rudy T. Erwin, S.H $11.00
by Dra. Moeslichatoen R., M.Pd $7.00
by Drs. Sudiyono, M.Si $6.00
by David Bach $12.00