Cite

United States postal card : write the address only on this side-the message on the other

MLA

United States Postal Card : Write the Address Only on This Side-the Message on the Other. United States Post Office Department, 0AD. https://collections.library.yale.edu/catalog/33532339.

APA, 6th edition

United States postal card : write the address only on this side-the message on the other. (0 C.E.). United States Post Office Department. https://collections.library.yale.edu/catalog/33532339.