by M.E. Dicks $6.00
by Hasan Basri Jumin $9.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by Ir. Ari Wijayani Purwanto $11.00
by Dr. Zakiah Daradjat, dkk $9.00
by Dennis A. Raudinelli $9.00