Bynagle, Hans E.
Philosophy : a guide to the reference literature / Hans E. Bynagle
Libraries Unlimited, 1986
Buku Referensi
Lauterbach, Richard E.
These are the Russians / Richard E. Lauterbach
Harper & Brother Publishers, 1945
Buku Teks SO
Strahlem, Richard E.
Cost control / Richard E. Strahlem
Lexander Hamilton Institute , 1961
Buku Teks
The JAL guide to the profesional literature
Artikel Jurnal
The JAL guide to professional literature
Artikel Jurnal