APA (7th ed.) Citation

McGuinn, R., Smith, J. S., & Key, F. S. (2004). Star-Spangled Banner. Project Gutenberg.

Chicago Style (17th ed.) Citation

McGuinn, Roger, John Stafford Smith, and Francis Scott Key. Star-Spangled Banner. Project Gutenberg, 2004.

MLA (9th ed.) Citation

McGuinn, Roger, et al. Star-Spangled Banner. Project Gutenberg, 2004.

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