Katalog Induk Daerah Sumatera Utara (KIDSU)
Badan Perpustakaan, Arsip, dan Dokumentasi
A Text - Book Of General Astronomy For Colleges And Scientific schools
Encyclopedia of America Business History and Biography
The Benjamin/Cummings Publishing Company
Breaking The Secretary Barrier : How to Get out From Behind The Typewriter and Into a Management Job
The Encyclopedia of Beaches And Coastal Environments