MLA

This Present Thursday, May 1, 1806, Will Be Presented (by Particular Desire) the Tragedy of Barbarossa ... publisher not identified, 0AD. https://collections.library.yale.edu/catalog/33206306.

APA, 6th edition

This present Thursday, May 1, 1806, will be presented (by particular desire) the tragedy of Barbarossa ... (0 C.E.). [Playbills, Broadsides]. publisher not identified. https://collections.library.yale.edu/catalog/33206306.