APA (7th ed.) Citation

Carman, C. C., & Evans, J. (2015). The two Earths of Eratosthenes.

Chicago Style (17th ed.) Citation

Carman, Christián C., and James Evans. The Two Earths of Eratosthenes. 2015.

MLA (9th ed.) Citation

Carman, Christián C., and James Evans. The Two Earths of Eratosthenes. 2015.

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