APA (7th ed.) Citation

DM, H. (2003). Planetary science: Sodium at Io. Nature, 421(6918), 30. https://doi.org/10.1038/421030a

Chicago Style (17th ed.) Citation

DM, Hunten. "Planetary Science: Sodium at Io." Nature 421, no. 6918 (2003): 30. https://doi.org/10.1038/421030a.

MLA (9th ed.) Citation

DM, Hunten. "Planetary Science: Sodium at Io." Nature, vol. 421, no. 6918, 2003, p. 30, https://doi.org/10.1038/421030a.

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