MLA

Portsmouth Theatre (Portsmouth, England). At the Theatre in Portsmouth, on Friday evening, being the 31st of August, will be presented a tragedy, call'd Romeo and Juliet ... : to which (by desire) will be added a farce, call'd The author ... tickets to be had at the Fountain ... and of Miss White, at Mr. Mottley's in High Street. [between 1748 and 1778]. https://collections.library.yale.edu/catalog/33208819.

APA, 6th edition

Portsmouth Theatre (Portsmouth, England). ([between 1748 and 1778])[At the Theatre in Portsmouth, on Friday evening, being the 31st of August, will be presented a tragedy, call'd Romeo and Juliet ... : to which (by desire) will be added a farce, call'd The author ... tickets to be had at the Fountain ... and of Miss White, at Mr. Mottley's in High Street]. https://collections.library.yale.edu/catalog/33208819.