1. ^{{cite web |last1=Hawtree |first1=Christopher |title=Richard Matheson obituary |url=https://www.theguardian.com/books/2013/jun/25/richard-matheson-i-am-legend |website=The Guardian |accessdate=31 March 2019 |date=25 June 2013}}
2. ^{{cite web |title=Authors : Guieu, Jimmy : SFE : Science Fiction Encyclopedia |url=http://www.sf-encyclopedia.com/entry/guieu_jimmy |website=www.sf-encyclopedia.com |accessdate=31 March 2019}}
3. ^{{cite web |title=Authors : Aldani, Lino : SFE : Science Fiction Encyclopedia |url=http://www.sf-encyclopedia.com/entry/aldani_lino |website=www.sf-encyclopedia.com |accessdate=31 March 2019}}
4. ^{{cite web |last1=Priest |first1=Christopher |title=Anne McCaffrey obituary |url=https://www.theguardian.com/books/2011/nov/23/anne-mccaffrey-obituary |website=The Guardian |accessdate=31 March 2019 |date=23 November 2011}}
5. ^{{cite web |last1=Priest |first1=Christopher |title=Obituary: John Middleton Murry |url=https://www.theguardian.com/news/2002/may/03/guardianobituaries.booksobituaries |website=The Guardian |accessdate=31 March 2019 |date=3 May 2002}}
6. ^{{cite web |last1=Vitello |first1=Paul |title=Frank M. Robinson Dies at 87; Author and Adviser to Harvey Milk |url=https://www.nytimes.com/2014/07/06/arts/frank-m-robinson-dies-at-87-author-and-adviser-to-harvey-milk.html |website=The New York Times |accessdate=31 March 2019 |date=4 July 2014}}
7. ^{{cite web |title=Poul Anderson |url=https://www.independent.co.uk/news/obituaries/poul-anderson-9146094.html |website=The Independent |accessdate=31 March 2019 |language=en |date=3 August 2001}}
8. ^{{cite web |title=Culture : Amazing Stories : SFE : Science Fiction Encyclopedia |url=http://www.sf-encyclopedia.com/entry/amazing |website=www.sf-encyclopedia.com |accessdate=31 March 2019}}
9. ^{{cite web |title=Media : von Harbou, Thea : SFE : Science Fiction Encyclopedia |url=http://www.sf-encyclopedia.com/entry/von_harbou_thea |website=www.sf-encyclopedia.com |accessdate=31 March 2019}}
10. ^{{cite web |title=The land of mist |url=https://www.worldcat.org/title/land-of-mist/oclc/1106012 |website=Worldcat |accessdate=31 March 2019 |language=English |date=1926}}
11. ^{{cite book |last1=Lemon |first1=Alaina |title=Technologies for Intuition: Cold War Circles and Telepathic Rays |date=2017 |publisher=Univ of California Press |isbn=9780520967458 |page=100 |url=https://books.google.co.uk/books?id=P-M5DwAAQBAJ&pg=PA100|language=en}}
12. ^{{cite book |last1=Bleiler |first1=Everett Franklin |last2=Bleiler |first2=Richard |title=Science-fiction: The Gernsback Years : a Complete Coverage of the Genre Magazines ... from 1926 Through 1936 |date=1998 |publisher=Kent State University Press |isbn=9780873386043 |page=552 |url=https://books.google.co.uk/books?id=PbMdeizaCNcC&pg=PA552|language=en}}