Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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