APA (7th ed.) Citation

Osterbrock, D. E., & O'Dell, C. R. (1968). Planetary Nebulae. Springer Netherlands.

Chicago Style (17th ed.) Citation

Osterbrock, Donald E., and C. R. O'Dell. Planetary Nebulae. Dordrecht: Springer Netherlands, 1968.

MLA (9th ed.) Citation

Osterbrock, Donald E., and C. R. O'Dell. Planetary Nebulae. Springer Netherlands, 1968.