APA (7th ed.) Citation

Clarke, R., Smith, A., & Priestley, J. (1792). Mr. Clarke's letters. [publisher not identified].

Chicago Style (17th ed.) Citation

Clarke, Richard, Adam Smith, and Joseph Priestley. Mr. Clarke's Letters. [Great Britain]: [publisher not identified], 1792.

MLA (9th ed.) Citation

Clarke, Richard, et al. Mr. Clarke's Letters. [publisher not identified], 1792.