Gaya APA
Soule, George. (1951).
Introduction to economic science .
New York:
New American Library.
Gaya Chicago
Soule, George.
Introduction to economic science.
New York:
New American Library,
1951.
Text.
Gaya MLA
Soule, George.
Introduction to economic science.
New York:
New American Library,
1951.
Text.
Gaya Turabian
Soule, George.
Introduction to economic science.
New York:
New American Library,
1951.
Print.