APA (7th ed.) Citation

Great Britain. Sovereign (1760-1820 : George III), Eyre, C., & Spottiswoode, A. Anno quinquagesimo quarto Georgii III. Regis.

Chicago Style (17th ed.) Citation

Great Britain. Sovereign (1760-1820 : George III), Charles Eyre, and Andrew Spottiswoode. Anno Quinquagesimo Quarto Georgii III. Regis.

MLA (9th ed.) Citation

Great Britain. Sovereign (1760-1820 : George III), et al. Anno Quinquagesimo Quarto Georgii III. Regis.

Warning: These citations may not always be 100% accurate.