APA (7th ed.) Citation

Meade, G. G., Barton, W. E., & William E. Barton Collection of Lincolniana. (1864). Letter: Headquarters, [Army of the Potomac], to Ulysses S. Grant, n.p.

Chicago Style (17th ed.) Citation

Meade, George Gordon, William E. Barton, and William E. Barton Collection of Lincolniana. Letter: Headquarters, [Army of the Potomac], to Ulysses S. Grant, N.p. 1864.

MLA (8th ed.) Citation

Meade, George Gordon, et al. Letter: Headquarters, [Army of the Potomac], to Ulysses S. Grant, N.p. 1864.