Powell, R. (2011). AQA AS economics, Unit 1, Markets and market failure: = Markets and market failure. Philip Allan.
Chicago-Zitierstil (17. Ausg.)Powell, Ray. AQA AS Economics, Unit 1, Markets and Market Failure: = Markets and Market Failure. Deddington: Philip Allan, 2011.
MLA-Zitierstil (9. Ausg.)Powell, Ray. AQA AS Economics, Unit 1, Markets and Market Failure: = Markets and Market Failure. Philip Allan, 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.