APA (7th ed.) Citation

Zimmer, C. (2014). The oldest rocks on earth. Scientific American, 310(3), 58. https://doi.org/10.1038/scientificamerican0314-58

Chicago Style (17th ed.) Citation

Zimmer, Carl. "The Oldest Rocks on Earth." Scientific American 310, no. 3 (2014): 58. https://doi.org/10.1038/scientificamerican0314-58.

MLA (9th ed.) Citation

Zimmer, Carl. "The Oldest Rocks on Earth." Scientific American, vol. 310, no. 3, 2014, p. 58, https://doi.org/10.1038/scientificamerican0314-58.