.Dolan, E. G. Basic economics (2th. ed.).
Cita Chicago (17th ed.).Dolan, Edvvin G. Basic Economics. 2th. ed.
Cita MLA (9th ed.).Dolan, Edvvin G. Basic Economics. 2th. ed.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)