Harford, T. (2010). Dear Under Cover Economist: The very best Letters from the 'Dear Economist' Column. Littele Brown.
Chicago-referens (17:e uppl.)Harford, Tim. Dear Under Cover Economist: The Very Best Letters from the 'Dear Economist' Column. Londn: Littele Brown, 2010.
MLA-referens (9:e uppl.)Harford, Tim. Dear Under Cover Economist: The Very Best Letters from the 'Dear Economist' Column. Littele Brown, 2010.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.