APA Style
Ruffin, Roy J., Gregory, Paul R.. (1988).
Principles of Economics Ed. 3 (Ke-3).
Amerika:
Scott, Foresman and Company.
Chicago Style
Ruffin, Roy J., Gregory, Paul R..
Principles of Economics Ed. 3.
Ke-3
Amerika:
Scott, Foresman and Company,
1988.
Text.
MLA Style
Ruffin, Roy J., Gregory, Paul R..
Principles of Economics Ed. 3.
Ke-3
Amerika:
Scott, Foresman and Company,
1988.
Text.
Turabian Style
Ruffin, Roy J., Gregory, Paul R..
Principles of Economics Ed. 3.
Ke-3
Amerika:
Scott, Foresman and Company,
1988.
Print.