Gaya APA
Samuelson, Paul A.. (1998).
Economics .
New York:
Mc Graw Hill.
Gaya Chicago
Samuelson, Paul A..
Economics.
New York:
Mc Graw Hill,
1998.
.
Gaya MLA
Samuelson, Paul A..
Economics.
New York:
Mc Graw Hill,
1998.
.
Gaya Turabian
Samuelson, Paul A..
Economics.
New York:
Mc Graw Hill,
1998.
.