Cite

US postal card : write the address on this side-the message on the other.

MLA

US Postal Card : Write the Address on This Side-the Message on the Other. United States Post Office Department, 0AD. https://collections.library.yale.edu/catalog/33532349.

APA, 6th edition

US postal card : write the address on this side-the message on the other. (0 C.E.). United States Post Office Department. https://collections.library.yale.edu/catalog/33532349.