Hirsch, E. (1967). Validity in interpretation. New Haven.
Lua i Stíl Chicago (17ú heag.)Hirsch, E.D. Validity in Interpretation. London: New Haven, 1967.
Lua MLA (9ú heag.)Hirsch, E.D. Validity in Interpretation. New Haven, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.