APA (7th ed.) Citation

Yardley, J. H., Morson, B. C., & Abell, M. R. (1977). The Gastrointestinal tract. Williams & Wilkins.

Chicago Style (17th ed.) Citation

Yardley, John H., Basil Clifford Morson, and Murray R. Abell. The Gastrointestinal Tract. Baltimore: Williams & Wilkins, 1977.

MLA (9th ed.) Citation

Yardley, John H., et al. The Gastrointestinal Tract. Williams & Wilkins, 1977.