"Sharp Laboratory, 1963 or later, From the Delaware Postcard Collection." https://library.artstor.org/public/SS33464_33464_19227485. Accessed 29 March 2023.
Sharp Laboratory, 1963 or later. Photographed by Robert Cohen, Published by University of Delaware, Newark, DE. Postcard, 9 x 14 cm. From the Delaware Postcard Collection.