1. Calderwood, W.L. (1907). Life of the Salmon. Edward Arnold, London.
2. Chitty, D. (1937). A ringing technique for small mammals. J. anim. Ecol., 6, 36–53.
3. Dudley, J.E. and Searles, E.M. (1923). Color marking of the striped cucumber beetle (Diabrotica vittata Fab.) and preliminary experiments to determine its flight. J. econ. Ent., 16, 363–368.
4. Eisentraut, M. (1935). Ergebrisse des Fledermausberingung. Ornith. Monatsber., 43, 150.
5. Fisher, J. and Peterson, R.T. (1964). The World of Birds. Macdonald, London.