Алби — разлика између измена

* {{Cite book |ref= harv|last = Mosheim| first = Johann Lorenz| title = Mosheim's Institutes of Ecclesiastical History, Ancient and Modern| url = http://books.google.com/books?id=EIEPAAAAIAAJ&pg=PA385| year = 1867| publisher = W. Tegg| pages = 385–}}