Soccini, C. and Ferro, V. 2012. A very large nesting colony of Delichon urbica and relative mobbing on Corvus monedula and Passer domesticus, with helpers, in Venosa town (Potenza province, south Italy). Rivista Italiana di Ornitologia. 81, 1 (Dec. 2012). DOI:https://doi.org/10.4081/rio.2011.81.