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|separator= (help) Outside the Optical: Other Kinds of Telescopes Gray, Meghan; Merrifield, Michael (2009). "Telescope Diameter". Sixty Symbols. Brady
Jakobsen, Peter (eds.). "The Performance of HST as an Infrared Telescope". Proc. SPIE. UV, Optical, and IR Space Telescopes and Instruments. 4013: 386–393.
Science and Technology (5th ed.). McGraw-Hill. 1993. "World's oldest telescope?". BBC News. 1999-07-01. Retrieved 2010-01-03. T. F. Hoad (1996). The
Audio: Cain/Gay – Astronomy Cast. Pulsars – Nov 2009 Australia National Telescope Facility: Pulsar Catalogue Johnston, William Robert. "List of Pulsars
planetary rings. Data from a deep optical survey by the Advanced Camera for Surveys on the Hubble Space Telescope suggest that no ring system is present