Cita APA (7a ed.)

FRANK H. Robert. (2009). Principles of Economics: Brief Edition. McGraw Hill.

Cita Chicago Style (17a ed.)

FRANK H. Robert. Principles of Economics: Brief Edition. New York: McGraw Hill, 2009.

Cita MLA (9a ed.)

FRANK H. Robert. Principles of Economics: Brief Edition. McGraw Hill, 2009.