Голуб дупљаш — разлика између измена

* {{Cite book |ref= harv|last=Gibbs| first =David | authorlink= |last2=Barnes|first2=Eustace|last3=Cox|first=John| title =Pigeons and Doves: A Guide to the Pigeons and Doves of the World | publisher =Pica Press | location =United Kingdom |pages=624| url =https://books.google.com/?id=aeZXAAAACAAJ&dq=Pigeons+and+Doves:+A+Guide+to+the+Pigeons+and+Doves+of+the+World