MLA

Portsmouth Theatre (Portsmouth, England). At the new theatre in Portsmouth, on Wednesday evening, October 14th, will be presented the tragedy of Romeo and Juliet ... : to which will be added a farce, call'd, The mock doctor: or The dumb lady cur'd .... [1761]. https://collections.library.yale.edu/catalog/33208654.

APA, 6th edition

Portsmouth Theatre (Portsmouth, England). ([1761])[At the new theatre in Portsmouth, on Wednesday evening, October 14th, will be presented the tragedy of Romeo and Juliet ... : to which will be added a farce, call'd, The mock doctor: or The dumb lady cur'd ...]. https://collections.library.yale.edu/catalog/33208654.