James J. Heckman, E. E. L. (2007). Handbook of Econometrics. ELSEVIER.
Lua i Stíl Chicago (17ú heag.)James J. Heckman, Edward E. Leamer. Handbook of Econometrics. ELSEVIER, 2007.
Lua MLA (8ú heag.)James J. Heckman, Edward E. Leamer. Handbook of Econometrics. ELSEVIER, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.