Παραπομπή APA

Lipsey, R. G. (1963). introduction to positive economics (3rd ed.). English Language Book Society.

Παραπομπή Chicago Style

Lipsey, Richard G. Introduction to Positive Economics. 3rd ed. London: English Language Book Society, 1963.

Παραπομπή MLA

Lipsey, Richard G. Introduction to Positive Economics. 3rd ed. English Language Book Society, 1963.