約翰·克里斯多夫

山姆·尤德（，），筆名為約翰·克里斯多夫（），英國科幻小說、懸疑小說作家，為《》的作者，1971年，他获得}}

外部链接
*
*

• [http://www.penguinclassics.co.uk/nf/Author/AuthorPage/0,,1000007107,00.html Biography at Penguin books website]
• [http://www.gnelson.demon.co.uk/tripage/jc.html Biography of Samuel Youd]
• [http://www.ecampus.com/white-mountains-35th-anniversary-edition/bk/9780689855047 Biographical sketch at ECampus.com website]
• [http://sf-encyclopedia.com/entry/christopher_john Christopher/Youd entry at the Encyclopedia of Science Fiction]
• [http://www.locusmag.com/News/2012/02/samuel-youd-aka-john-christopher-1922-2012/ Obituary at Locus Magazine]
• [http://www.tor.com/blogs/2012/02/john-christopher-1922-2012 John Christopher obituary] by Jo Walton
• [http://www.guardian.co.uk/books/2012/feb/06/john-christopher-samuel-youd John Christopher Obituary The Guardian]
• [http://www.nytimes.com/2012/02/08/books/john-christopher-science-fiction-writer-dies-at-89.html?_r=0/ Obituary at New York Times]
• [https://web.archive.org/web/20090519080258/http://www.colinbrockhurst.co.uk/interview-with-tripods-author-sam-youd-aka-john-christopher/380/ Interview with John Christopher], 1999
• [http://lccn.loc.gov/n50039796 John Christopher] at Library of Congress Authorities —with 59 catalogue records for works by John Christopher, linked to records under six other names