APA (7th ed.) Citation

American Colonization Society, Clay, H., Barton, W. E., & William E. Barton Collection of Lincolniana. (1849). Certificate of membership: Washington, D.C.

Chicago Style (17th ed.) Citation

American Colonization Society, Henry Clay, William E. Barton, and William E. Barton Collection of Lincolniana. Certificate of Membership: Washington, D.C. 1849.

MLA (8th ed.) Citation

American Colonization Society, et al. Certificate of Membership: Washington, D.C. 1849.