This article incorporates text from this source, which is in the public domain. Grimwood, James M.; Hacker, Barton C.; Vorzimmer, Peter J. "PART I (A) Concept and Design April 1959 through December 1961". Project Gemini Technology and Operations - A Chronology. NASA Special Publication-4002. NASA. Retrieved 18 February 2023.
Ralph L. Higgs (August 4, 1961). Report on Hurricane Anna - July 20, 1961. U.S. Weather Bureau Office San Juan, Puerto Rico (Report). San Juan, Puerto Rico: National Oceanic and Atmospheric Administration; National Hurricane Center. p. 11. Retrieved December 3, 2013.
Langley, Brig C A (22 December 1961), Report on the Collision at Singleton Bank(PDF), HMSO, retrieved 2009-01-10; "Train Crash Fatal to Six- 125 Others Are Hurt in Britain on Way to Sea Coast", Milwaukee Journal, July 17, 1961, p2
"RUSSIA: The New Gospel", TIME Magazine, August 11, 1961; "Russian Press, Radio Hammer Home Khrushchev Vision of Red Utopia", Saskatoon Star-Phoenix, July 31, 1961, p. 1; "The 1961 Party Programme and the fate of Khrushchev's reforms", by Alexander Titov, in Soviet State and Society under Nikita Khrushchev (Taylor & Francis US, 2009), p. 18.