Northampton, including Siegfried, Northampton County, Pennsylvania, November 1911 : formerly Alliance

Chicago citation style
Sanborn Map Company. Northampton, including Siegfried, Northampton County, Pennsylvania, November 1911 : formerly Alliance. 1911. Retrieved from the Digital Public Library of America, http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/19390. (Accessed December 15, 2018.)
APA citation style
Sanborn Map Company, (1911) Northampton, including Siegfried, Northampton County, Pennsylvania, November 1911 : formerly Alliance. Retrieved from the Digital Public Library of America, http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/19390
MLA citation style
Sanborn Map Company. Retrieved from the Digital Public Library of America <http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/19390>.
Note: These citations are programmatically generated and may be incomplete.