MLA

Simpson, Randolph Linsly, 1927-1992. E.G. Renesch, Chicago, [IL], "Colored Man is No Slacker:" World War I poster (in Series I). Box 59, folder 1324. 1918. https://collections.library.yale.edu/catalog/2032261.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 59, folder 1324"])(1918)[E.G. Renesch, Chicago, [IL], "Colored Man is No Slacker:" World War I poster (in Series I)]. https://collections.library.yale.edu/catalog/2032261.