Template:Harris & Ladd, 2005
- Harris, R.C. & Ladd, D.M. 2005. Preliminary draft: Ozark lichens; Enumerating the lichens of the Ozark Highlands of Arkansas, Kansas, Illinois, Missouri, and Oklahoma: Prepared for the 14th Tuckerman Lichen Workshop.: 1–149. RLL List # 241 / Rec.# 36944 – Recent Literature on Lichens The New York Botanical Garden