Gaya APA
Foster, Edward. (1973).
Economics an introductry program (text).
New York:
McGraw Hill Book Company.
Gaya Chicago
Foster, Edward.
Economics an introductry program.
text
New York:
McGraw Hill Book Company,
1973.
Tesis.
Gaya MLA
Foster, Edward.
Economics an introductry program.
text
New York:
McGraw Hill Book Company,
1973.
Tesis.
Gaya Turabian
Foster, Edward.
Economics an introductry program.
text
New York:
McGraw Hill Book Company,
1973.
Tesis.