MLA

McGlashan, E. L. (Everitt Lynn), 1911-1978. Green, Stephen of Georgetown, South Carolina, emancipation of "a mulatto female slave named Jenny and her son William". Box 1, folder 33A. 1819 Aug 19. https://collections.library.yale.edu/catalog/33219782.

APA, 6th edition

McGlashan, E. L. (Everitt Lynn), 1911-1978. (["Box 1, folder 33A"])(1819 Aug 19)[Green, Stephen of Georgetown, South Carolina, emancipation of "a mulatto female slave named Jenny and her son William"]. https://collections.library.yale.edu/catalog/33219782.