Cite

Canada post card : the address only to written on this side

MLA

Canada Post Card : the Address Only to Written on This Side. Post Office Department, 0AD. https://collections.library.yale.edu/catalog/33532344.

APA, 6th edition

Canada post card : the address only to written on this side. (0 C.E.). [Sources, Legal instruments]. Post Office Department. https://collections.library.yale.edu/catalog/33532344.