Campbell, B. M. & W. L. Receipt for sale of "four Negro slaves named Betsy and her three children... Rachel, Clea, and Eliza" to E. H. Simmons. Baltimore, [Maryland] (C2)
MLA
McGlashan, E. L. (Everitt Lynn), 1911-1978. Campbell, B. M. & W. L. Receipt for sale of "four Negro slaves named Betsy and her three children... Rachel, Clea, and Eliza" to E. H. Simmons. Baltimore, [Maryland] (C2). Box 1, folder 17. 1851 Sep 4. https://collections.library.yale.edu/catalog/10191752.
APA, 6th edition
McGlashan, E. L. (Everitt Lynn), 1911-1978. (["Box 1, folder 17"])(1851 Sep 4)[Campbell, B. M. & W. L. Receipt for sale of "four Negro slaves named Betsy and her three children... Rachel, Clea, and Eliza" to E. H. Simmons. Baltimore, [Maryland] (C2)]. https://collections.library.yale.edu/catalog/10191752.