Koestler, A., Hardy, D., & Viereck, P. (1961). Darkness at noon: By Arthur Koestler. Transl. by Daphne Hardy. With a Foreword by Peter Viereck (13. print.). The New American Library.
Lua i Stíl Chicago (17ú heag.)Koestler, Arthur, Daphne Hardy, agus Peter Viereck. Darkness at Noon: By Arthur Koestler. Transl. by Daphne Hardy. With a Foreword by Peter Viereck. 13. print. New York: The New American Library, 1961.
Lua MLA (8ú heag.)Koestler, Arthur, et al. Darkness at Noon: By Arthur Koestler. Transl. by Daphne Hardy. With a Foreword by Peter Viereck. 13. print. The New American Library, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.