Gaya APA
Hopper, W. David. (1973).
Research policy: eleven issues / W. David Hopper .
Colombia:
.
Gaya Chicago
Hopper, W. David.
Research policy: eleven issues / W. David Hopper.
Colombia:
,
1973.
.
Gaya MLA
Hopper, W. David.
Research policy: eleven issues / W. David Hopper.
Colombia:
,
1973.
.
Gaya Turabian
Hopper, W. David.
Research policy: eleven issues / W. David Hopper.
Colombia:
,
1973.
.