APA (7th ed.) Citation

Cooper, J. F., Spiller, R. E., & Bernard, S. (1931). Letter to Gen. Lafayette. Published for the Facsimile text society by Columbia university press.

Chicago Style (17th ed.) Citation

Cooper, James Fenimore, Robert Ernest Spiller, and Simon Bernard. Letter to Gen. Lafayette. New York: Published for the Facsimile text society by Columbia university press, 1931.

MLA (9th ed.) Citation

Cooper, James Fenimore, et al. Letter to Gen. Lafayette. Published for the Facsimile text society by Columbia university press, 1931.