1. Spallanzani L (1769) An Essay on Animal Reproductions. T Becket, London (translated from Italian by M. Maty)
2. Bosch TCG (1998) Hydra, in Cellular and Molecular Basis of Regeneration: From Invertebrates to Humans (Ferretti P, Geraudie J, eds) pp. 111–134. Wiley, New York
3. Experimental studies of the regeneration in Planararia maculata;Morgan;Wilhelm Roux Arch. Entwicklungsmech Org.,1898
4. Morgan TH (1901) Regeneration. Columbia University, New York
5. Bromodeoxyuridine specifically labels the regenerative stem cells of planarians;Newmark;Dev. Biol.,2000