APA Style
RUFFIN, Roy J., GREGORY, Paul R.. (1997).
Principles of Economics (6th ed.).
MASSACHUSETTS:
Addison-Wesley.
Chicago Style
RUFFIN, Roy J., GREGORY, Paul R..
Principles of Economics.
6th ed.
MASSACHUSETTS:
Addison-Wesley,
1997.
Teks Book.
MLA Style
RUFFIN, Roy J., GREGORY, Paul R..
Principles of Economics.
6th ed.
MASSACHUSETTS:
Addison-Wesley,
1997.
Teks Book.
Turabian Style
RUFFIN, Roy J., GREGORY, Paul R..
Principles of Economics.
6th ed.
MASSACHUSETTS:
Addison-Wesley,
1997.
Teks Book.