APA (7th ed.) Citation

Kelloff, C. L., Funk, V. A., & Alexander, S. N. Smithsonian plant collections, Guiana Shield.

Chicago Style (17th ed.) Citation

Kelloff, Carol Lynn, V. A. Funk, and Sara N. Alexander. Smithsonian Plant Collections, Guiana Shield.

MLA (9th ed.) Citation

Kelloff, Carol Lynn, et al. Smithsonian Plant Collections, Guiana Shield.