Samuelson, P. (2018). Economics (19th.). McGraw Hill.
Cita Chicago (17th ed.)Samuelson, Paul. Economics. 19th. McGraw Hill, 2018.
Cita MLA (9th ed.)Samuelson, Paul. Economics. 19th. McGraw Hill, 2018.
Atenció: Aquestes cites poden no estar 100% correctes.