1. Redshift and Hubble’s Law at: https://starchild.gsfc.nasa.gov/docs/StarChild/questions/redshift.html.
2. Physics for Scientists and Engineers;Giancola,2009
3. Measurement of the Velocity of Light from Mt. Wilson to Mt. San Antonio, contributions from the Mount Wilson observatory, No. 329;Michelson;Astrophys. J.,1927
4. On the electrodynamics of moving bodies;Einstein,1905
5. Characteristics of light: velocity, massless energy, and special relativity;Sauerheber;Optik,2018