Gaya APA
Samuelson, Paul A.. (2005).
Economics (18th ed.).
Boston:
McGraw-Hill.
Gaya Chicago
Samuelson, Paul A..
Economics.
18th ed.
Boston:
McGraw-Hill,
2005.
Text.
Gaya MLA
Samuelson, Paul A..
Economics.
18th ed.
Boston:
McGraw-Hill,
2005.
Text.
Gaya Turabian
Samuelson, Paul A..
Economics.
18th ed.
Boston:
McGraw-Hill,
2005.
Print.