by F. Budi Hardiman $9.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by Prof. drh. Charles Rangga Tabbu, M.Sc., Ph.D $18.00
by John Kirvan $6.00
by Anthony Harton $4.00
by Dr. Muslim Nasution $6.00