Cita APA

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

Citación estilo Chicago

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

Cita MLA

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