APA (7th ed.) Citation

Rogers, J. E. (2011). Trees Worth Knowing. Project Gutenberg.

Chicago Style (17th ed.) Citation

Rogers, Julia Ellen. Trees Worth Knowing. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Rogers, Julia Ellen. Trees Worth Knowing. Project Gutenberg, 2011.

Warning: These citations may not always be 100% accurate.