On Saturday Evening, May 7, 1803, their Majesties' Servants will perform the last new comic opera, called Family Quarrels ... : to which will be added, the much admired comic opera, called Lock and key ...
MLA
On Saturday Evening, May 7, 1803, Their Majesties' Servants Will Perform the Last New Comic Opera, Called Family Quarrels ... : to Which Will Be Added, the Much Admired Comic Opera, Called Lock and Key ... T. Wilson and R. Spence, Printers, High Ousegate, York, 0AD. https://collections.library.yale.edu/catalog/33208245.
APA, 6th edition
On Saturday Evening, May 7, 1803, their Majesties' Servants will perform the last new comic opera, called Family Quarrels ... : to which will be added, the much admired comic opera, called Lock and key ... (0 C.E.). [Playbills, Broadsides]. T. Wilson and R. Spence, Printers, High Ousegate, York. https://collections.library.yale.edu/catalog/33208245.