APA (7th ed.) Citation

Karl, C., & Christlieb, N. (2003). Double degenerates from the Supernova Ia Progenitor Survey (SPY). White dwarfs.

Chicago Style (17th ed.) Citation

Karl, Christian, and Norbert Christlieb. "Double Degenerates from the Supernova Ia Progenitor Survey (SPY)." White Dwarfs 2003.

MLA (9th ed.) Citation

Karl, Christian, and Norbert Christlieb. "Double Degenerates from the Supernova Ia Progenitor Survey (SPY)." White Dwarfs, 2003.

Warning: These citations may not always be 100% accurate.