Yardley, J. H., Morson, B. C., & Abell, M. R. (1977). The Gastrointestinal tract. Williams & Wilkins.
Lua i Stíl Chicago (17ú heag.)Yardley, John H., Basil Clifford Morson, agus Murray R. Abell. The Gastrointestinal Tract. Baltimore: Williams & Wilkins, 1977.
Lua MLA (9ú heag.)Yardley, John H., et al. The Gastrointestinal Tract. Williams & Wilkins, 1977.
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