MLA

Hewitt, John H. Santa Anna's L.E.G. from Illustrations of the Mexican War, Written & Composed by John H. Hewitt. F. D. Benteen. W. T. Mayo, 1848. https://collections.library.yale.edu/catalog/2001021.

APA, 6th edition

Hewitt, J. H. (1848). Santa Anna's L.E.G. from Illustrations of the Mexican War, written & composed by John H. Hewitt [Sheet music covers]. F. D. Benteen. W. T. Mayo. https://collections.library.yale.edu/catalog/2001021.