* Gawthrop, Peter J. and Smith, Lorcan P. S., 1996: "Metamodelling: bond graphs and dynamic systems", Prentice Hall, ISBN 0-13-489824-9.
* Gawthrop, Peter J. and Smith, Lorcan P. S., 1996: "Metamodelling: bond graphs and dynamic systems", Prentice Hall, ISBN 0-13-489824-9.