Citazione Stile APA (7a Edizione)
Portugal, P. (2007). U.S. unemployment duration: Has long become longer or short become shorter? Czech National Bank.
Citazione stile Chigago Style (17a edizione)
Portugal, Pedro. U.S. Unemployment Duration: Has Long Become Longer or Short Become Shorter? Praha: Czech National Bank, 2007.
Citatione MLA (9a ed.)
Portugal, Pedro. U.S. Unemployment Duration: Has Long Become Longer or Short Become Shorter? Czech National Bank, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.