Cita APA (7a ed.)
Lipsey, R. G. (1990). <An> Introduction to Positive Economics (7. ed.). Weidenfeld and Nicolson.
Cita Chicago Style (17a ed.)
Lipsey, Richard G. <An> Introduction to Positive Economics. 7. ed. London: Weidenfeld and Nicolson, 1990.
Cita MLA (9a ed.)
Lipsey, Richard G. <An> Introduction to Positive Economics. 7. ed. Weidenfeld and Nicolson, 1990.
Precaución: Estas citas no son 100% exactas.