APA (7th ed.) Citation

Union, A. O. (1998). Frontmatter. Zenodo.

Chicago Style (17th ed.) Citation

Union, American Ornithologists'. Frontmatter. Zenodo, 1998.

MLA (9th ed.) Citation

Union, American Ornithologists'. Frontmatter. Zenodo, 1998.

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