Gaya APA
James, Clifford L.. (1956).
Principles of economics (9th.ed).
New York:
Barnes and Noble.
Gaya Chicago
James, Clifford L..
Principles of economics.
9th.ed
New York:
Barnes and Noble,
1956.
Text.
Gaya MLA
James, Clifford L..
Principles of economics.
9th.ed
New York:
Barnes and Noble,
1956.
Text.
Gaya Turabian
James, Clifford L..
Principles of economics.
9th.ed
New York:
Barnes and Noble,
1956.
Print.