APA (7th ed.) Citation

Phillips, W. S. (1970). Psilotum nudum New to Arizona. Zenodo.

Chicago Style (17th ed.) Citation

Phillips, Walter S. Psilotum Nudum New to Arizona. Zenodo, 1970.

MLA (9th ed.) Citation

Phillips, Walter S. Psilotum Nudum New to Arizona. Zenodo, 1970.

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