Digital Commonwealth

MLA

The observatory, Smith College, Northampton, Mass.. New Haven, Conn.: Danziger & Berman, 1906. Web. 22 Feb 2019. <https://ark.digitalcommonwealth.org/ark:/50959/dz011249h>.

APA

The observatory, Smith College, Northampton, Mass. [Card]. (1906). Retrieved from https://ark.digitalcommonwealth.org/ark:/50959/dz011249h

Chicago

"The observatory, Smith College, Northampton, Mass." Card. New Haven, Conn.: Danziger & Berman, 1906. Digital Commonwealth, https://ark.digitalcommonwealth.org/ark:/50959/dz011249h (accessed February 22, 2019).