APA (7th ed.) Citation

Sagan, C., & Veverka, J. (1967). Martian ionosphere. Science, 158, 110. https://doi.org/10.1126/science.158.3797.110

Chicago Style (17th ed.) Citation

Sagan, C., and J. Veverka. "Martian Ionosphere." Science 158 (1967): 110. https://doi.org/10.1126/science.158.3797.110.

MLA (9th ed.) Citation

Sagan, C., and J. Veverka. "Martian Ionosphere." Science, vol. 158, 1967, p. 110, https://doi.org/10.1126/science.158.3797.110.