A manual of the principal instruments used in American engineering and surveying

Chicago citation style
W. & L.E. Gurley (Firm). A manual of the principal instruments used in American engineering and surveying. 1855-1921. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/100638100. (Accessed November 13, 2018.)
APA citation style
W. & L.E. Gurley (Firm), (1855-1921) A manual of the principal instruments used in American engineering and surveying. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/100638100
MLA citation style
W. & L.E. Gurley (Firm). Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/100638100>.
Note: These citations are programmatically generated and may be incomplete.