APA aipamena

Chrystal K Alec & Lipsey, R. G. (1995). Introduction to positive economics. ELBS with Oxford universtity.

Chicago Style aipamena

Chrystal K Alec and Richard G. Lipsey. Introduction to Positive Economics. Pren: ELBS with Oxford universtity, 1995.

MLA aipamena

Chrystal K Alec and Richard G. Lipsey. Introduction to Positive Economics. ELBS with Oxford universtity, 1995.