by Ir. Doli Siregar, M.Sc., FRICS., SVC $11.00
by Tamir Agmon $7.00
by A. Rani Usman $20.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Indra Darmawan, S.E $7.00
by Drs. W. Kuswandi $9.00
by Dr. Ibrahim Bafadal, M.Pd $7.00
by Ir. Surya Suhatmansyah dan Drs. Djalinus Syah $11.00
by Tanenbaum $13.00
by S. Mara Gd $7.00
by J. M. Coetze $21.00