Scott, Robert B (2015). Teaching the gravitational redshift: lessons from the history and philosophy of physics. Spanish Relativity Meeting (ERE 2014). Journal of Physics: Conference Series (bằng tiếng Anh). 600 (1). tr. 012055. Bibcode:2015JPhCS.600a2055S. doi:10.1088/1742-6596/600/1/012055.
Scott, Robert B (2015). Teaching the gravitational redshift: lessons from the history and philosophy of physics. Spanish Relativity Meeting (ERE 2014). Journal of Physics: Conference Series (bằng tiếng Anh). 600 (1). tr. 012055. Bibcode:2015JPhCS.600a2055S. doi:10.1088/1742-6596/600/1/012055.