Black Hole Models for Active Galactic Nuclei

Martin J. Rees
1984

http://www.annualreviews.org/doi/abs/10.1146/annurev.aa.22.090184.002351

A classic.

See also

https://ned.ipac.caltech.edu/level5/Rees3/Rees_contents.html

http://www.nature.com/ncomms/journal/v3/n12/full/ncomms2314.html