by Robert A. Dahl $9.00
by Bob Sugeng Hadiwinata, Ph. D $9.00
by Idris Thaha $11.00
by Rineka Cipta $7.00
by Ir. Irianto Aritonang, dkk $6.00
by J. Suyuthi Pulungan $9.00
by Dr. Juraid Abdul Latief, M.Hum $7.00