- ^ H.G. Wells, The Discovery of the Future, London: Jonathan Cape, Ltd, 1925,(p.54).
- ^ Wikisource:Supernatural Horror in Literature/The Weird Tradition in the British Isles
- ^ Georges T. Dodds, review of Volume I of the Morse series, including the serial text.
- ^ R. D. Mullen, review of the Gregg Press edition of The Purple Cloud, Science Fiction Studies, November 1977.
- ^ Marion Powell, review of the Gregg Press edition (1901 text). Archived 19 August 2009 at the Wayback Machine
- ^ Jeff Gardiner, review of Tartarus edition. (1901 text).
- ^ William P. Simmons, review of The House of Sounds and Others (includes 1901 text).
- ^ Greg Beatty, review of The House of Sounds and Others. Archived 4 February 2010 at the Wayback Machine
- ^ skullsinthestars, review of The House of Sounds and Others.
- ^ Notice Archived 10 August 2014 at the Wayback Machine of Penguin Classics edition. (1901 text).
- ^ Georges T. Dodds, review of the Bison Books edition (1929 text).
- ^ A. Reynolds Morse, The Works of M. P. Shiel Updated, Vol II of The Works of M. P. Shiel, Cleveland: The Morse Foundation (1980), 18.
- ^ Translated by Soledad Silio, "Foreword" by Antonio Iriarte, Madrid: Reino de Redonda, 2005.
- ^ "Esta absurda aventura", El País, 23 Aug 2008
- ^ John D. Squires, "Shiel's Liquid Air Engines in The Purple Cloud" Archived 12 May 2017 at the Wayback Machine,The New York Review of Science Fiction, December 2009, # 256, Vol 22, No 4 (Dec 2009), 6.
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