Gaya APA
Gill, Richard T.. (1978).
Economics : a text with readings (3rd ed.).
Santa Monica, California:
Goodyear.
Gaya Chicago
Gill, Richard T..
Economics : a text with readings.
3rd ed.
Santa Monica, California:
Goodyear,
1978.
Text.
Gaya MLA
Gill, Richard T..
Economics : a text with readings.
3rd ed.
Santa Monica, California:
Goodyear,
1978.
Text.
Gaya Turabian
Gill, Richard T..
Economics : a text with readings.
3rd ed.
Santa Monica, California:
Goodyear,
1978.
Print.