APA (7th ed.) Citation

Smith, A. H. (1972). The North American species of Psathyrella. New York Botanical Garden.

Chicago Style (17th ed.) Citation

Smith, Alexander Hanchett. The North American Species of Psathyrella. Bronx, NY: New York Botanical Garden, 1972.

MLA (9th ed.) Citation

Smith, Alexander Hanchett. The North American Species of Psathyrella. New York Botanical Garden, 1972.

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