MLA

Simpson, Randolph Linsly, 1927-1992. Unknown printer Fundraising mailing card for "Cotton Blossom Singers from 'The Piney Woods Country Life School', Braxton, Mississippi:" Exterior group photo with Laurence C. Jones, Principal. Postcard 5-1/2 x 3-1/2. Box 25, folder 1036. circa 1910. https://collections.library.yale.edu/catalog/32312572.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25, folder 1036"])(circa 1910)[Unknown printer Fundraising mailing card for "Cotton Blossom Singers from 'The Piney Woods Country Life School', Braxton, Mississippi:" Exterior group photo with Laurence C. Jones, Principal. Postcard 5-1/2 x 3-1/2]. https://collections.library.yale.edu/catalog/32312572.