APA (7th ed.) Citation

United States. Bureau of Entomology. (1918). Destruction of spruce and hemlock by western hemlock looper. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Bureau of Entomology. Destruction of Spruce and Hemlock by Western Hemlock Looper. [Washington]: [publisher not identified], 1918.

MLA (9th ed.) Citation

United States. Bureau of Entomology. Destruction of Spruce and Hemlock by Western Hemlock Looper. [publisher not identified], 1918.

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