Hughes, T., & Chadwick, M. G. (1927). The plurality of worlds and other essays. Longmans, Green and Co., ltd..
Lua i Stíl Chicago (17ú heag.)Hughes, Thomas, agus M. G. Chadwick. The Plurality of Worlds and Other Essays. New York, London [etc.]: Longmans, Green and Co., ltd., 1927.
Lua MLA (8ú heag.)Hughes, Thomas, agus M. G. Chadwick. The Plurality of Worlds and Other Essays. Longmans, Green and Co., ltd., 1927.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.