MLA

Portsmouth Theatre (Portsmouth, England). At the theatre in Portsmouth, this present Wednesday, being the 22d of August, will be presented a tragedy, call'd Richard the Third ... : to which will be added a farce, call'd Miss in her teens ... tickets to be had at the Fountain ... and Two Blue Posts, on the point. [1759]. https://collections.library.yale.edu/catalog/33208673.

APA, 6th edition

Portsmouth Theatre (Portsmouth, England). ([1759])[At the theatre in Portsmouth, this present Wednesday, being the 22d of August, will be presented a tragedy, call'd Richard the Third ... : to which will be added a farce, call'd Miss in her teens ... tickets to be had at the Fountain ... and Two Blue Posts, on the point]. https://collections.library.yale.edu/catalog/33208673.