APA
Lipsey R., Lipsey R., . (2015). Economics. United Kingdom: Oxford University Press.
Chicago
Lipsey Richard, Lipsey Richard, . 2015. Economics. United Kingdom: Oxford University Press.
Harvard
Lipsey R., Lipsey R., . (2015). Economics. United Kingdom: Oxford University Press.
MLA
Lipsey Richard, Lipsey Richard, . Economics. United Kingdom: Oxford University Press. 2015.