APA (7th ed.) Citation

Clark, W., Clark, J., & Holmberg, J. J. (2002). Dear brother: Letters of William Clark to Jonathan Clark. Yale University Press.

Chicago Style (17th ed.) Citation

Clark, William, Jonathan Clark, and James J. Holmberg. Dear Brother: Letters of William Clark to Jonathan Clark. New Haven, Conn.: Yale University Press, 2002.

MLA (9th ed.) Citation

Clark, William, et al. Dear Brother: Letters of William Clark to Jonathan Clark. Yale University Press, 2002.