APA (7th ed.) Citation

United States. Division of Botany. (1901). Canada thistle. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Division of Botany. Canada Thistle. [Washington]: [publisher not identified], 1901.

MLA (9th ed.) Citation

United States. Division of Botany. Canada Thistle. [publisher not identified], 1901.

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