by Ir. Hatta Sunanta, B.Sc., MS $5.00
by Soekartawi $5.00
by Prof. Dr. Ir. Tri Yuwanta S.U., DEA $7.00
by Prof. Djafaruddin $9.00
by Krauss, Herbert L., dkk $11.00
by Koentjaraningrat $6.00