Digital Commonwealth

MLA

100" reflecting telescope Mt. Wilson Calif.. 1906. Web. 16 Feb 2019. <https://ark.digitalcommonwealth.org/ark:/50959/dz0113849>.

APA

100" reflecting telescope Mt. Wilson Calif. [Card]. (1906). Retrieved from https://ark.digitalcommonwealth.org/ark:/50959/dz0113849

Chicago

"100" reflecting telescope Mt. Wilson Calif." Card. 1906. Digital Commonwealth, https://ark.digitalcommonwealth.org/ark:/50959/dz0113849 (accessed February 16, 2019).