MLA

Theatre Royal (York, England). On Monday evening, August 24, 1801, their Majesties' servants will perform the favourite comedy, called The belle's stratagem ... : after which, the musical entertainment, called The poor soldier .... [1801]. https://collections.library.yale.edu/catalog/33208167.

APA, 6th edition

Theatre Royal (York, England). ([1801])[On Monday evening, August 24, 1801, their Majesties' servants will perform the favourite comedy, called The belle's stratagem ... : after which, the musical entertainment, called The poor soldier ...]. https://collections.library.yale.edu/catalog/33208167.