APA (7th ed.) Citation

American Physiological Society (1887- ), Schultz, S. G., Rauner, B. B., Wood, J. D., & Forte, J. G. (1989). The gastrointestinal system. American Physiological Society.

Chicago Style (17th ed.) Citation

American Physiological Society (1887- ), Stanley G. Schultz, Brenda B. Rauner, Jack D. Wood, and John G. Forte. The Gastrointestinal System. Bethesda, Md.: American Physiological Society, 1989.

MLA (9th ed.) Citation

American Physiological Society (1887- ), et al. The Gastrointestinal System. American Physiological Society, 1989.