Gaya APA
Samuelson, Paul A., Norhaus, William D. (s.a.).
Economics .
New York:
McGraw Hill, Inc..
Gaya Chicago
Samuelson, Paul A., Norhaus, William D.
Economics.
New York:
McGraw Hill, Inc.,
s.a..
Text.
Gaya MLA
Samuelson, Paul A., Norhaus, William D.
Economics.
New York:
McGraw Hill, Inc.,
s.a..
Text.
Gaya Turabian
Samuelson, Paul A., Norhaus, William D.
Economics.
New York:
McGraw Hill, Inc.,
s.a..
Print.