history-1. Ashley, Mike; Nicholls, Peter; Stableford, Brian. Amazing Stories. The Encyclopedia of Science Fiction. Gollancz. 2014-07-14 [2020-05-18]. (原始内容存档于2020-05-13).
history-2. Ashley, Mike; Edwards, Malcolm; Nicholls, Peter. SF Magazines. The Encyclopedia of Science Fiction. Gollancz. 2014-08-23 [2020-05-18]. (原始内容存档于2019-09-15).
encyclopedia-profile. Stableford, Brian; Nicholls, Peter; Langford, David; Ashley, Mike. Science-Fiction Plus. The Encyclopedia of Science Fiction. Gollancz. 2015-05-24 [2020-05-18]. (原始内容存档于2020-04-15).
Golden Age. Nicholls, Peter; Ashley, Mike. Golden Age of SF. The Encyclopedia of Science Fiction. Gollancz. 2015-04-09 [2020-05-18]. (原始内容存档于2019-11-11).
web.archive.org
history-1. Ashley, Mike; Nicholls, Peter; Stableford, Brian. Amazing Stories. The Encyclopedia of Science Fiction. Gollancz. 2014-07-14 [2020-05-18]. (原始内容存档于2020-05-13).
history-2. Ashley, Mike; Edwards, Malcolm; Nicholls, Peter. SF Magazines. The Encyclopedia of Science Fiction. Gollancz. 2014-08-23 [2020-05-18]. (原始内容存档于2019-09-15).
encyclopedia-profile. Stableford, Brian; Nicholls, Peter; Langford, David; Ashley, Mike. Science-Fiction Plus. The Encyclopedia of Science Fiction. Gollancz. 2015-05-24 [2020-05-18]. (原始内容存档于2020-04-15).
Golden Age. Nicholls, Peter; Ashley, Mike. Golden Age of SF. The Encyclopedia of Science Fiction. Gollancz. 2015-04-09 [2020-05-18]. (原始内容存档于2019-11-11).