1. Harvey William: Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus. Translated by Leake Chauncey D. 3rd Ed., Springfield, Ill., and Baltimore, Md., Charles C. Thomas, 1941, p. 48.
2. Magendie F. Précis Élémentaire de Physiologie, Paris, Mequignon-Marvis, 2: 58–67, 1816–1817.
3. Cannon W. B.: The Mechanical Factors of Digestion, New York, Longmans, Green and Co., 1911, pp. 11–31.