APA (7th ed.) Citation

Illick, J. S. (1928). Pennsylvania trees. Pennsylvania Department of forests and waters.

Chicago Style (17th ed.) Citation

Illick, Joseph S. Pennsylvania Trees. [Harrisburg., Pa.]: Pennsylvania Department of forests and waters, 1928.

MLA (9th ed.) Citation

Illick, Joseph S. Pennsylvania Trees. Pennsylvania Department of forests and waters, 1928.