Lipsey, R. G. (1990). An introduction to positive economics (7th ed., repr.). George Weindenfeld and Nicolson.
Cita Chicago Style (17a ed.)Lipsey, Richard G. An Introduction to Positive Economics. 7th ed., repr. London: George Weindenfeld and Nicolson, 1990.
Cita MLA (8a ed.)Lipsey, Richard G. An Introduction to Positive Economics. 7th ed., repr. George Weindenfeld and Nicolson, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.