Merritt, David (2013). Dynamics and Evolution of Galactic Nuclei. Princeton, NJ: Princeton University Press. ISBN 9781400846122. 9781400846122
B. M. Peterson, K. Horne, Reverberation Mapping of Active Galactic Nuclei (2004). https://arxiv.org/abs/astro-ph/0407538
Merritt, David (2013). Dynamics and Evolution of Galactic Nuclei. Princeton, NJ: Princeton University Press. ISBN 9781400846122. 9781400846122
Merritt, David (2013). Dynamics and Evolution of Galactic Nuclei. Princeton, NJ: Princeton University Press. ISBN 9781400846122. 9781400846122