Gaya APA
Ruffin, Roy J., Gregory, Paul R.. (1938).
Principles of macroeconomics .
Glenview, Illinois:
Scott, Foresman.
Gaya Chicago
Ruffin, Roy J., Gregory, Paul R..
Principles of macroeconomics.
Glenview, Illinois:
Scott, Foresman,
1938.
Text.
Gaya MLA
Ruffin, Roy J., Gregory, Paul R..
Principles of macroeconomics.
Glenview, Illinois:
Scott, Foresman,
1938.
Text.
Gaya Turabian
Ruffin, Roy J., Gregory, Paul R..
Principles of macroeconomics.
Glenview, Illinois:
Scott, Foresman,
1938.
Print.