Jacobson, R. A. и др. The GM values of Mimas and Tethys and the libration of Methone // Astronomical Journal 132 (2). 2005. DOI:10.1086/505209. с. 711.
Herschel, W. Account of the Discovery of a Sixth and Seventh Satellite of the Planet Saturn; With Remarks on the Construction of Its Ring, Its Atmosphere, Its Rotation on an Axis, and Its Spheroidical Figure // Philosophical Transactions of the Royal Society of London 80. 1790. DOI:10.1098/rstl.1790.0001. с. 1 – 20.