MLA

Simpson, Randolph Linsly, 1927-1992. Attributed to Southworth and Hawes, Boston. William Lloyd Garrison, George Thompson and Wendell Phillips, seated at a table. Un-cased Daguerreotype, quarter plate. Box 1, folder 2. circa 1850-51. https://collections.library.yale.edu/catalog/2002064.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 1, folder 2"])(circa 1850-51)[Attributed to Southworth and Hawes, Boston. William Lloyd Garrison, George Thompson and Wendell Phillips, seated at a table. Un-cased Daguerreotype, quarter plate]. https://collections.library.yale.edu/catalog/2002064.