James J. Heckman, E. L. (2001). Handbook of Econometrics. ELSEVIER.
Lua i Stíl Chicago (17ú heag.)James J. Heckman, Edward Leamer. Handbook of Econometrics. ELSEVIER, 2001.
Lua MLA (8ú heag.)James J. Heckman, Edward Leamer. Handbook of Econometrics. ELSEVIER, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.