Gaya APA
Samuelson, Paul A., Nordhaus, William D.. (2001).
Economics, 7th ed. (ed.7).
Boston:
Irwin.
Gaya Chicago
Samuelson, Paul A., Nordhaus, William D..
Economics, 7th ed..
ed.7
Boston:
Irwin,
2001.
Text.
Gaya MLA
Samuelson, Paul A., Nordhaus, William D..
Economics, 7th ed..
ed.7
Boston:
Irwin,
2001.
Text.
Gaya Turabian
Samuelson, Paul A., Nordhaus, William D..
Economics, 7th ed..
ed.7
Boston:
Irwin,
2001.
Print.