1. Birkhead T. R. Moller A. P. (1998): Sperm competition and sexual selection. – Academic Press, 826 pp
2. Ferner W. J. (2007): A review of marking and individual recognition techniques for amphibians and reptiles. – Society for the Study of Amphibians and Reptiles, 78 pp
3. Osenegg K. (1989): Die Amphibien und Reptilien der Insel Zypern. – M.Sc. Thesis, University of Bonn, 200 pp
4. Schuett G. W. (1992): Is long sperm storage an important component of the reproductive biology of temperate pit vipers? In: J. A. Campbell & E. D. Brodie (Eds), Biology of Pitvipers. – Selva
5. William J. S. (1996): Ecological Census Techniques, a handbook. – Cambridge, 352 pp