Gaya APA
Economics. (1985).
Canada:
Little, brown and company.
Gaya Chicago
Economics.
.
Canada:
Little, brown and company,
1985.
.
Gaya MLA
Economics.
.
Canada:
Little, brown and company,
1985.
.
Gaya Turabian
Economics.
Canada:
Little, brown and company,
1985.
.