Gaya APA
Rich, Robert F.. (1981).
The knowledge cycle. .
s.l.:
Sage Publications.
Gaya Chicago
Rich, Robert F..
The knowledge cycle..
s.l.:
Sage Publications,
1981.
Text.
Gaya MLA
Rich, Robert F..
The knowledge cycle..
s.l.:
Sage Publications,
1981.
Text.
Gaya Turabian
Rich, Robert F..
The knowledge cycle..
s.l.:
Sage Publications,
1981.
Print.