by Ir. Doli Siregar, M.Sc., FRICS., SVC $11.00
by Von Der Mehden $9.00
by Drs. Firman B. Aji dan Drs. Martin Sirait $9.00
by Ratna Batara Munti $7.00
by James Lull $23.00
by Drs. A.W. Widjaja $9.00