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References
- 1 2 3 4 5 Dick, Steven J. (2013-09-09). Discovery and Classification in Astronomy: Controversy and Consensus. Cambridge University Press. p. 187. ISBN 9781107276710.
- ↑ Shields, Gregory A. (1999). "A Brief History of Active Galactic Nuclei". The Publications of the Astronomical Society of the Pacific. 111 (760): 661–678. arXiv: astro-ph/9903401 . Bibcode:1999PASP..111..661S. doi:10.1086/316378. S2CID 18953602 . Retrieved 3 October 2014.
- ↑ "Our Activities". European Space Agency . Retrieved 3 October 2014.
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