Cita APA (7th ed.)

Lipsey, R. (1986). An intro to positive economics (6th.). ELBS.

Cita Chicago (17th ed.)

Lipsey, Richard. An Intro to Positive Economics. 6th. London: ELBS, 1986.

Cita MLA (9th ed.)

Lipsey, Richard. An Intro to Positive Economics. 6th. ELBS, 1986.