Gaya APA
An Introduction to Regional Economics. (1971).
New York:
Alfred A Knopf.
Gaya Chicago
An Introduction to Regional Economics.
.
New York:
Alfred A Knopf,
1971.
.
Gaya MLA
An Introduction to Regional Economics.
.
New York:
Alfred A Knopf,
1971.
.
Gaya Turabian
An Introduction to Regional Economics.
New York:
Alfred A Knopf,
1971.
.