Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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