1. Paré, Ambrose: Opera Chirurgica ab Ambrose Pareo, Frankfort 1610, ch. 30, p. 230.
2. Hildanus, Fabricus: Opera Gulielmi Hildami, Frankfort 1646; cen 2: obs. 33, p. 108.
3. Riverius, Lazari: Opera Medica Universa, London, 1698, obs. Cent quart. ob. 67.
4. Morgagni: Seats and Causes of Diseases, Vol. III, Letter 54, 1769.
5. Cooper, Sir Astley: Treatise on Hernia, London, 1824.