<ref name="Luniak_&_Pisarski_1982">{{cite book |first1=M. |last1=Luniak |first2=B. |last2=Pisarski |year=1982 |title=Animals in urban environment. Proceedings of the Symposium on the occasion of the 60th anniversary of the Institute Zoology of the Polish Academy of Sciences |url= |location=Wroclaw |publisher=Polska Akademia Nauk |pages=175 pp. |isbn=}}</ref>