Cite

Spins, W. Receipt for sale of "a Negro man named Peter," sold to E. H. Simmons. Hamburg (C3)

MLA

McGlashan, E. L. (Everitt Lynn), 1911-1978. Spins, W. Receipt for sale of "a Negro man named Peter," sold to E. H. Simmons. Hamburg (C3). Box 1, folder 20. 1857 Dec 18. https://collections.library.yale.edu/catalog/33219121.

APA, 6th edition

McGlashan, E. L. (Everitt Lynn), 1911-1978. (["Box 1, folder 20"])(1857 Dec 18)[Spins, W. Receipt for sale of "a Negro man named Peter," sold to E. H. Simmons. Hamburg (C3)]. https://collections.library.yale.edu/catalog/33219121.