Дрво — разлика између измена

* {{Cite book|ref=harv|last=Coombs|first=Duncan|author2last2=Blackburne-Maze, |first2=Peter |last3=Cracknell|first3=Martyn|last4=Bentley|first4=Roger|year=2001|title= The Complete Book of Pruning, Sterling Publishing Compan |isbn=9781841881430|url= http://books.google.com/books?id=Le1pi3Vz31wC&pg=PA99&dq=topiary+is&hl=en&ei=5WsqTLW2CML-nAeF2omjAQ&sa=X&oi=book_result&ct=book-preview-link&resnum=1&ved=0CDYQuwUwAA#v=onepage&q=topiary%20is&f=false |pages=99}}