1. Hippocrates. In: Kühn CG (1825) Medicorum graecorum opera quae exstant. Leipzig, C, Cnoblochius, Volume 21, p 500
2. van Forestus P (1610) Observationum et curationum chirurgicarum Libri Quinque Lugduni Batavorum (i.e., Leyden), Ex. Officiana Plantiniana Raphelengii
3. Tulpius N (1641) Observationes medicae. Amsterdam Elzevirium, see Libri III, pp 231 for illustration and plate
4. Furukawa T (1987) First description of spina bifida by Nicolaas Tulp. Neurol 37:1816–1828. See also Rickham PP (1963) Nicolaas Tulp and spina bifida. Clin Peds 2:40-42
5. Severinus, Marcus Aurelius (1632) De Recondita abscessum natura. Neapoli, Beltranum