APA (7th ed.) Citation

Fraknoi, A., Morrison, D., & Wolff, S. C. (2022). Astronomy 2e (2e.). OpenStax CNX.

Chicago Style (17th ed.) Citation

Fraknoi, Andrew, David Morrison, and Sidney C. Wolff. Astronomy 2e. 2e. [Place of publication not identified]: OpenStax CNX, 2022.

MLA (9th ed.) Citation

Fraknoi, Andrew, et al. Astronomy 2e. 2e. OpenStax CNX, 2022.