Stat og forklare lov om samtale af masse?
Momentum
Park, David (1990). The how and the why : et essay om den fysiske teoris oprindelse og udvikling. Med tegninger af Robin Brickman (3. trykte udgave). Princeton, N.J.: Princeton University Press. pp. 139-141. ISBN 9780691025087.
Momentum
Park, David (1990). The how and the why : an essay on the origins and development of physical theory. With drawings by Robin Brickman (3rd print ed.). Princeton, N.J.: Princeton University Press. pp. 139–141. ISBN 9780691025087.
Momentum