"Co-eds waiting for the class bell to ring"
MLA
"Co-Eds Waiting for the Class Bell to Ring". 1951. https://collections.library.yale.edu/catalog/16856516.
APA, 6th edition
"Co-eds waiting for the class bell to ring". (1951). [Photographs (AAT)]. https://collections.library.yale.edu/catalog/16856516.