APA-referens (7:e uppl.)

Barr, N. (2012). Economics of the Welfare State (5th.). Oxford.

Chicago-referens (17:e uppl.)

Barr, Nicholas. Economics of the Welfare State. 5th. UK: Oxford, 2012.

MLA-referens (9:e uppl.)

Barr, Nicholas. Economics of the Welfare State. 5th. Oxford, 2012.