APA (7th ed.) Citation
Lipsey, R. G. (1990). <An> Introduction to Positive Economics (7. ed.). Weidenfeld and Nicolson.
Chicago Style (17th ed.) Citation
Lipsey, Richard G. <An> Introduction to Positive Economics. 7. ed. London: Weidenfeld and Nicolson, 1990.
MLA (9th ed.) Citation
Lipsey, Richard G. <An> Introduction to Positive Economics. 7. ed. Weidenfeld and Nicolson, 1990.
Warning: These citations may not always be 100% accurate.