APA (7th ed.) Citation

Osterbrock, D. E. (1989). Astrophysics of gaseous nebulae and active galactic nuclei. Univ. Science Books.

Chicago Style (17th ed.) Citation

Osterbrock, Donald E. Astrophysics of Gaseous Nebulae and Active Galactic Nuclei. Mill Valley, Calif: Univ. Science Books, 1989.

MLA (9th ed.) Citation

Osterbrock, Donald E. Astrophysics of Gaseous Nebulae and Active Galactic Nuclei. Univ. Science Books, 1989.