429667 Lipsey, R. G. (1983). An introduction to positive economics. London : Weidenfeld & Nicolson.
Lua i Stíl Chicago (17ú heag.)429667 Lipsey, Richard G. An Introduction to Positive Economics. London : Weidenfeld & Nicolson, 1983.
Lua MLA (9ú heag.)429667 Lipsey, Richard G. An Introduction to Positive Economics. London : Weidenfeld & Nicolson, 1983.
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