Gaya APA
Willoughby, Theodore C., Senn, James. (1975).
Business Systems .
Ohio:
Association for Systems Management.
Gaya Chicago
Willoughby, Theodore C., Senn, James.
Business Systems.
Ohio:
Association for Systems Management,
1975.
Text.
Gaya MLA
Willoughby, Theodore C., Senn, James.
Business Systems.
Ohio:
Association for Systems Management,
1975.
Text.
Gaya Turabian
Willoughby, Theodore C., Senn, James.
Business Systems.
Ohio:
Association for Systems Management,
1975.
Print.