APA Style
Barro, R, J., Sala-i-Martin, X. (2004).
Economic Grawth (Edition 2).
United states of America:
Prentice-Hall.
MLA Style
Barro, Robert, J.., Sala-i-Martin, Xavier.
"Economic Grawth".
Edition 2
United states of America:
Prentice-Hall,
2004.
Text.