APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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