APA (7th ed.) Citation

(1721). A treatise of the plague. Being an instruction how one ought to act etc. London.

Chicago Style (17th ed.) Citation

A Treatise of the Plague. Being an Instruction How One Ought to Act Etc. London, 1721.

MLA (8th ed.) Citation

A Treatise of the Plague. Being an Instruction How One Ought to Act Etc. London, 1721.

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