APA (7th ed.) Citation

Wright, M. O., Chapman, F. M., & Seton, E. T. (1898). Four-footed Americans and their kin. Macmillan.

Chicago Style (17th ed.) Citation

Wright, Mabel Osgood, Frank M. Chapman, and Ernest Thompson Seton. Four-footed Americans and Their Kin. New York: Macmillan, 1898.

MLA (9th ed.) Citation

Wright, Mabel Osgood, et al. Four-footed Americans and Their Kin. Macmillan, 1898.