Klasa (biologija) — разлика између измена

* {{Cite book | author = Stuessy, Tod F. | title = Plant taxonomy: the systematic evaluation of comparative data | publisher = Columbia University Press | location = New York | year = 2009 | pages = 53 | isbn = 0-231-14712-0 | oclc = | url=http://books.google.com/books?id=0bYs8F0Mb9gC&pg=PP81&lpg=PP81&dq=different+taxonomists+taking+different+positions&source=bl&ots=5OJmMBysDE&sig=Xsfe_1aXkVwurHN27pSxShm4M14&hl=en&ei=Z8YOTYKvKobmsQOg_uHdAg&sa=X&oi=book_result&ct=result&resnum=7&sqi=2&ved=0CEcQ6AEwBg#v=onepage&q&f=false | accessdate = | ref = harv}}