HUBBARD, R. G. (2017). Economics. Pearson Education.
Cita Chicago (17th ed.)HUBBARD, R. Glenn. Economics. Pearson Education, 2017.
Cita MLA (9th ed.)HUBBARD, R. Glenn. Economics. Pearson Education, 2017.
Atenció: Aquestes cites poden no estar 100% correctes.