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"'Bonus' Payload Set for Transit 2A Orbit". Aviation Week and Space Technology. New York: McGraw Hill Publishing Company. June 20, 1960. Diarsipkan dari versi asli tanggal January 1, 2019. Diakses tanggal January 8, 2019.
Committee on the Navy's Needs in Space for Providing Future Capabilities, Naval Studies Board, Division on Engineering and Physical Sciences, National Research Council of the National Academies (2005). "Appendix A: Department of the Navy History in Space". Navy's Needs in Space for Providing Future Capabilities. Washington D.C.: The National Academies Press. hlm. 157. doi:10.17226/11299. ISBN978-0-309-18120-4. Diarsipkan dari versi asli tanggal January 7, 2019. Diakses tanggal January 6, 2019.
Constance Green and Milton Lomask (1970). Vanguard — a History. Washington D.C.: National Aeronautics and Space Administration. ISBN978-1-973532-09-5. SP-4202. Diarsipkan dari versi asli tanggal 2016-03-03. Diakses tanggal 2019-05-10.