Hausman, J. (1993). Contingent Valuation. ELSEVIER.
Lua i Stíl Chicago (17ú heag.)Hausman, J.A. Contingent Valuation. ELSEVIER, 1993.
Lua MLA (8ú heag.)Hausman, J.A. Contingent Valuation. ELSEVIER, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.