APA (7th ed.) Citation

Bengtson, S., & Rasmussen, B. (2009). New and Ancient Trace Makers. The American Association for the Advancement of Science.

Chicago Style (17th ed.) Citation

Bengtson, S., and Birger Rasmussen. New and Ancient Trace Makers. The American Association for the Advancement of Science, 2009.

MLA (9th ed.) Citation

Bengtson, S., and Birger Rasmussen. New and Ancient Trace Makers. The American Association for the Advancement of Science, 2009.

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