Gaya APA
Samuelson, paul a, Nordhaus, William d. (1995).
Economics .
United States of America:
mc graw hill.
Gaya Chicago
Samuelson, paul a, Nordhaus, William d.
Economics.
United States of America:
mc graw hill,
1995.
Text.
Gaya MLA
Samuelson, paul a, Nordhaus, William d.
Economics.
United States of America:
mc graw hill,
1995.
Text.
Gaya Turabian
Samuelson, paul a, Nordhaus, William d.
Economics.
United States of America:
mc graw hill,
1995.
Print.