A. G. Bell, speaking telephone, no. 201,488, patented March 19, 1878

Chicago citation style
A. G. Bell, speaking telephone, no. 201,488, patented March 19, 1878. Retrieved from the Digital Public Library of America, http://digitalcollections.nypl.org/items/510d47dc-8dcb-a3d9-e040-e00a18064a99. (Accessed August 15, 2018.)
APA citation style
A. G. Bell, speaking telephone, no. 201,488, patented March 19, 1878. Retrieved from the Digital Public Library of America, http://digitalcollections.nypl.org/items/510d47dc-8dcb-a3d9-e040-e00a18064a99
MLA citation style
Retrieved from the Digital Public Library of America <http://digitalcollections.nypl.org/items/510d47dc-8dcb-a3d9-e040-e00a18064a99>.
Note: These citations are programmatically generated and may be incomplete.