APA (7th ed.) Citation

Valtonen, M. J., & Heidt, J. (2008). A massive binary black-hole system in OJ 287 and a test of general relativity. Nature, 452, . https://doi.org/10.1038/nature06896

Chicago Style (17th ed.) Citation

Valtonen, Mauri J., and Jochen Heidt. "A Massive Binary Black-hole System in OJ 287 and a Test of General Relativity." Nature 452 (2008). https://doi.org/10.1038/nature06896.

MLA (9th ed.) Citation

Valtonen, Mauri J., and Jochen Heidt. "A Massive Binary Black-hole System in OJ 287 and a Test of General Relativity." Nature, vol. 452, 2008, https://doi.org/10.1038/nature06896.