^ 3.03.1Moore, Gerry; Kershner, Bruce; Tufts, Craig; Mathews, Daniel; Nelson, Gil; Spellenberg, Richard; Thieret, John W.; Purinton, Terry; Block, Andrew. National Wildlife Federation Field Guide to Trees of North America. New York: Sterling Publishing(英语:Sterling Publishing). May 9, 2008: 66. ISBN 978-1-4027-3875-3(英语). 引文格式1维护:显示-作者 (link)