Joseph Wharton Professional Management postage stamp, full sheet

Chicago citation style
Joseph Wharton Professional Management postage stamp, full sheet. 1981. Retrieved from the Digital Public Library of America, http://dla.library.upenn.edu/dla/archives/image.html?id=ARCHIVES_20050720020. (Accessed December 14, 2018.)
APA citation style
(1981) Joseph Wharton Professional Management postage stamp, full sheet. Retrieved from the Digital Public Library of America, http://dla.library.upenn.edu/dla/archives/image.html?id=ARCHIVES_20050720020
MLA citation style
Retrieved from the Digital Public Library of America <http://dla.library.upenn.edu/dla/archives/image.html?id=ARCHIVES_20050720020>.
Note: These citations are programmatically generated and may be incomplete.