Cita APA (7th ed.)

Orrell, D., & Van Loon, B. (2011). Introducing economics: A graphic guide. Icon Books.

Cita Chicago (17th ed.)

Orrell, David, i Borin Van Loon. Introducing Economics: A Graphic Guide. London: Icon Books, 2011.

Cita MLA (9th ed.)

Orrell, David, i Borin Van Loon. Introducing Economics: A Graphic Guide. Icon Books, 2011.