APA (7th ed.) Citation

Seward, W. H., Barton, W. E., & William E. Barton Collection of Lincolniana. (1851). Letter: Auburn, N.Y., to John Hughes, New York.

Chicago Style (17th ed.) Citation

Seward, William H., William E. Barton, and William E. Barton Collection of Lincolniana. Letter: Auburn, N.Y., to John Hughes, New York. 1851.

MLA (8th ed.) Citation

Seward, William H., et al. Letter: Auburn, N.Y., to John Hughes, New York. 1851.

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