Purdy, Boston, MA, Boston Latin: group portrait (in Series I)
MLA
Simpson, Randolph Linsly, 1927-1992. Purdy, Boston, MA, Boston Latin: group portrait (in Series I). Box 54, folder 1265. 1906. https://collections.library.yale.edu/catalog/10613740.
APA, 6th edition
Simpson, Randolph Linsly, 1927-1992. (["Box 54, folder 1265"])(1906)[Purdy, Boston, MA, Boston Latin: group portrait (in Series I)]. https://collections.library.yale.edu/catalog/10613740.