The Plants of Pennsylvania, Second Edition by Ann Fowler Rhoads & Timothy A. Block, 2007

Trees of Pennsylvania, Field Guide by Stan Tekiela, 2004

Aquatic Plants of Pennsylvania, A Complete Reference Guide by Timothy A. Block and Ann Fowler Rhoads, 2011

A Guide to Common Pennsylvania Wildflowers by Carol Sanderson, 2010

Wildflowers of Northeastern/North-central North America, Peterson Field Guides by Roger Tory Peterson and Margaret McKenny, 1996

Peterson First Guide to Wildflowers by Roger Tory Peterson, 1986

Ferns of Northeastern and Central North America, Peterson Field Guides by Cobb, Farnsworth and Lowe, 2005

Outstanding Mosses and Liverwort of Pennsylvania & Nearby States by Susan Munch, 2006

Common Mosses of the Northeast and Appalachians, Princeton Field Guides by McKnight, Rohrer, McKnight Ward and Perdrizet, 2013

Lichens of the North Woods by Joe Walewski, 2007

Plant Identification Terminology, An Illustrated Glossary by James Harris and Melinda Woolf Harris, 2015