APA (7th ed.) Citation

United States National Herbarium. Contributions from the United States National Herbarium. Smithsonian Institution Press.

Chicago Style (17th ed.) Citation

United States National Herbarium. Contributions from the United States National Herbarium. Washington,: Smithsonian Institution Press.

MLA (8th ed.) Citation

United States National Herbarium. Contributions from the United States National Herbarium. Smithsonian Institution Press.

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