APA (7th ed.) Citation

Clepper, H. E. (1934). Hemlock: The state tree of Pennsylvania. Dept. of Forests and Waters.

Chicago Style (17th ed.) Citation

Clepper, Henry Edward. Hemlock: The State Tree of Pennsylvania. Harrisburg, Pa.: Dept. of Forests and Waters, 1934.

MLA (8th ed.) Citation

Clepper, Henry Edward. Hemlock: The State Tree of Pennsylvania. Dept. of Forests and Waters, 1934.