Ridenour, G. M. Shelley's optimism: George M. Ridenour. Shelley : a collection of critical essays.(1965).
Lua i Stíl Chicago (17ú heag.)Ridenour, George M. "Shelley's Optimism: George M. Ridenour." Shelley : A Collection of Critical Essays.(1965) .
Lua MLA (8ú heag.)Ridenour, George M. "Shelley's Optimism: George M. Ridenour." Shelley : A Collection of Critical Essays.(1965), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.