Cite

1970 November--National Guardsmen; police (May Day)

MLA

1970 November--National Guardsmen; Police (May Day). 1917. https://collections.library.yale.edu/catalog/10011649.

APA, 6th edition

1970 November--National Guardsmen; police (May Day). (1917). https://collections.library.yale.edu/catalog/10011649.