Digital Commonwealth

MLA

[Map of the world on a polyconic projection]. 1850. Web. 24 Oct 2018. <https://ark.digitalcommonwealth.org/ark:/50959/x633f9782>.

APA

[Map of the world on a polyconic projection] [Map]. (1850). Retrieved from https://ark.digitalcommonwealth.org/ark:/50959/x633f9782

Chicago

"[Map of the world on a polyconic projection]." Map. 1850. Digital Commonwealth, https://ark.digitalcommonwealth.org/ark:/50959/x633f9782 (accessed October 24, 2018).