MLA

The Honble. Sr. Wm. Howe Knight of the Bath, & Commander in Chief of His Majesty's Forces in America / [Graphic]. Publish'd as the act directs, 10th Novr. 1777, by John Morris, Rathbone Place, 0AD. https://collections.library.yale.edu/catalog/33191303.

APA, 6th edition

The Honble. Sr. Wm. Howe Knight of the Bath, & Commander in Chief of his Majesty's Forces in America / [graphic]. (0 C.E.). [Portrait prints, Mezzotints England London 1777]. Publish'd as the act directs, 10th Novr. 1777, by John Morris, Rathbone Place. https://collections.library.yale.edu/catalog/33191303.