* {{cite book | last=Ellenberg | first=Heinz | title=Indicator values of plants in Central Europe | publisher=Verlag Erich Goltze GmbH & Co KG | publication-place=Göttingen | date=1992 | isbn=978-3-88452-518-0 | language=de}}
<ref name="p518">{{cite book | last=Ellenberg | first=Heinz | title=Indicator values of plants in Central Europe | publisher=Verlag Erich Goltze GmbH & Co KG | publication-place=Göttingen | date=1992 | isbn=978-3-88452-518-0 | language=de | page=}}</ref>