Stephenson, F. R., & Willis, D. M. (2002). The earliest datable observation of the Aurora Borealis. Under one sky, 421-428.
Chicago Style (17th ed.) CitationStephenson, Francis Richard, and David M. Willis. "The Earliest Datable Observation of the Aurora Borealis." Under One Sky 2002: 421-428.
MLA (8th ed.) CitationStephenson, Francis Richard, and David M. Willis. "The Earliest Datable Observation of the Aurora Borealis." Under One Sky, 2002, pp. 421-428.
Warning: These citations may not always be 100% accurate.