Fickert, K. J. (1972). To heaven and back: The new morality in the plays of Friedrich Dürrenmatt. Univ. Pr. of Kentucky.
Lua i Stíl Chicago (17ú heag.)Fickert, Kurt J. To Heaven and Back: The New Morality in the Plays of Friedrich Dürrenmatt. Lexington: Univ. Pr. of Kentucky, 1972.
Lua MLA (8ú heag.)Fickert, Kurt J. To Heaven and Back: The New Morality in the Plays of Friedrich Dürrenmatt. Univ. Pr. of Kentucky, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.