What Are Radio Telescopes? (n.d.). Retrieved from https://public.nrao.edu/telescopes/radio-telescopes
Radio Telescope. (n.d.). Retrieved from http://abyss.uoregon.edu/~js/glossary/radio_telescope.html
How does a Radio Telescope Work? (n.d.). Retrieved from http://www.atnf.csiro.au/outreach/education/pulseatparkes/radiotelescopeintro.html
F. Ghigo. "Pre-History of Radio Astronomy". National Radio Astronomy Observatory. Retrieved 2010-04-09.
Shields, Gregory A. (1999). "A brief history of AGN". The Publications of the Astronomical Society of the Pacific 111 (760): 661–678. Retrieved 3 October 2014.