Cita APA (7th ed.)

Beckmann, V., & Shrader, C. R. (2012). Active galactic nuclei. Wiley-VCH ; John Wiley [distributor].

Cita Chicago (17th ed.)

Beckmann, Volker, i Chris R. Shrader. Active Galactic Nuclei. Weinheim : Chichester: Wiley-VCH ; John Wiley [distributor], 2012.

Cita MLA (9th ed.)

Beckmann, Volker, i Chris R. Shrader. Active Galactic Nuclei. Wiley-VCH ; John Wiley [distributor], 2012.