[Concord Rotaflex advertisement]
MLA
[Concord Rotaflex Advertisement]. 1969. https://collections.library.yale.edu/catalog/9998443.
APA, 6th edition
[Concord Rotaflex advertisement]. (1969). [Advertisements, Halftones, Photomechanical prints]. https://collections.library.yale.edu/catalog/9998443.