Jason; Erik Brudvig. Call of Duty: World at War -- Convoy Shredding and Soviet Sniping. IGN. July 10, 2008 [2008-09-29]. (原始内容存档于2008-09-12). 引文使用过时参数coauthors
[2007-03-27]. (原始内容存档于2008-12-31). Kuhn, Betsy. The race for space: the United States and the Soviet Union compete for the new frontier. Twenty-First Century
Explosions Since the Big Bang. Space Telescope Science Institute: 1–8. 1999. ISBN 0-521-79141-3. Pedersen, H.; et al. Deep Searches for Burster Counterparts