APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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