1998. ISBN 0-674-27225-0. Needham, Joseph; Ronan, Colin Alistair. The Shorter Science and Civilisation in China: An Abridgement of Joseph Needham's Original
2020-02-16 [2020-02-17]. (原始内容存档于2020-02-16) (英国英语). Doctor Who boss confirms shorter season 13 as filming begins. Radio Times. [2020-11-11]. (原始内容存档于2020-11-12)