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
Torrey, Theodore W.
Morphogenesis of the vertebrates
John Wiley & Sons, 1979
 Buku Teks
Strahlem, Richard E.
Cost control / Richard E. Strahlem
Lexander Hamilton Institute , 1961
 Buku Teks
Stutely, Richard
Guide to economic indicators/ Richard Stutely
Century Business, 1992
 Buku Teks