MLA

Portsmouth Theatre (Portsmouth, England). At the theatre in Portsmouth, this present Friday, being the 29th of June, will be presented the Beggar's Opera ... : to which will be added a dramatick satire, call'd, Lethe: or, Aesop in the shades ... tickets to be had at the Fountain ... and Two Blue Posts, on the point. [1759]. https://collections.library.yale.edu/catalog/33208735.

APA, 6th edition

Portsmouth Theatre (Portsmouth, England). ([1759])[At the theatre in Portsmouth, this present Friday, being the 29th of June, will be presented the Beggar's Opera ... : to which will be added a dramatick satire, call'd, Lethe: or, Aesop in the shades ... tickets to be had at the Fountain ... and Two Blue Posts, on the point]. https://collections.library.yale.edu/catalog/33208735.