* {{cite book | last=Little | first=Elbert Luther | last2=Society | first2=National Audubon | title=National Audubon Society Field Guide to North American Trees | publisher=Knopf | publication-place=New York | date=1980-06-12 | isbn=0-394-50761-4}}
<ref name="g113">{{cite book | last=Little | first=Elbert Luther | last2=Society | first2=National Audubon | title=National Audubon Society Field Guide to North American Trees | publisher=Knopf | publication-place=New York | date=1980-06-12 | isbn=0-394-50761-4 | page=}}</ref>