Draper, C. S.; Wrigley, W.; Hoag, G.; Battin, R. H.; Miller, E.; Koso, A.; Hopkins, A. L.; Vander Velde, W. E. (June 1965). Apollo Guidance and Navigation(PDF) (Report). Massachusetts: Massachusetts Institute of Technology, Instrumentation Laboratory. pp. I-3 et seqq. Retrieved October 12, 2014.