APA (7th ed.) Citation

Fraknoi, A., Morrison, D., & Wolff, S. C. (2022). Astronomy (2nd ed.). Openstax, Houston.

Chicago Style (17th ed.) Citation

Fraknoi, Andrew, David Morrison, and Sidney C. Wolff. Astronomy. 2nd ed. Texas: Openstax, Houston, 2022.

MLA (8th ed.) Citation

Fraknoi, Andrew, et al. Astronomy. 2nd ed. Openstax, Houston, 2022.