Kupershmidt, B. A. (1992). The variational principles of dynamics. World Scientific.
Dyfyniad Arddull ChicagoKupershmidt, Boris A. The Variational Principles of Dynamics. Singapore: World Scientific, 1992.
Dyfyniad MLAKupershmidt, Boris A. The Variational Principles of Dynamics. World Scientific, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.