Site accessibility and characteristic velocity requirements for direct-descent lunar landings

Chicago citation style
Weyers, Vernon J. Site accessibility and characteristic velocity requirements for direct-descent lunar landings. [1970]. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011444049. (Accessed November 21, 2018.)
APA citation style
Weyers, Vernon J, ([1970]) Site accessibility and characteristic velocity requirements for direct-descent lunar landings. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011444049
MLA citation style
Weyers, Vernon J. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/011444049>.
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