"Time Invariance". EECS20N. Ptolemy Project. Archived from the original on 2011-07-17. Retrieved 2010-12-12.
bikecalculator.com
Bicycle calculator – speed, weight, wattage etc. "Bike Calculator". Archived from the original on 2009-05-13. Retrieved 2009-05-29..
books.google.com
Jaffe, Robert L.; Taylor, Washington (2018). The Physics of Energy. Cambridge University Press. p. 611. ISBN9781107016651. Archived from the original on 2022-07-30. Retrieved 2022-05-22.
"Time Invariance". EECS20N. Ptolemy Project. Archived from the original on 2011-07-17. Retrieved 2010-12-12.
Jaffe, Robert L.; Taylor, Washington (2018). The Physics of Energy. Cambridge University Press. p. 611. ISBN9781107016651. Archived from the original on 2022-07-30. Retrieved 2022-05-22.