APA (7th ed.) Citation

Spence, J., & Hill, R. (1753). Letter to the Revd. Mr. G.R. [publisher not identified].

Chicago Style (17th ed.) Citation

Spence, Joseph, and Robert Hill. Letter to the Revd. Mr. G.R. [London?]: [publisher not identified], 1753.

MLA (9th ed.) Citation

Spence, Joseph, and Robert Hill. Letter to the Revd. Mr. G.R. [publisher not identified], 1753.