APA (7th ed.) Citation

Seward, W. H., Barton, W. E., & William E. Barton Collection of Lincolniana. (1840). Letter signed: Albany, N.Y., to Bishop John Hughes, New York.

Chicago Style (17th ed.) Citation

Seward, William H., William E. Barton, and William E. Barton Collection of Lincolniana. Letter Signed: Albany, N.Y., to Bishop John Hughes, New York. 1840.

MLA (8th ed.) Citation

Seward, William H., et al. Letter Signed: Albany, N.Y., to Bishop John Hughes, New York. 1840.