Robert J. Whitaker, »Types of Two-Dimensional Pendulums and Their Uses in Education«, in: The Pendulum: Scientific, Historical, Philosophical and Educational Perspectives, (eds.) Michael R Matthews, Colin F Gauld, Arthur Stinner (Dordrecht: Springer, 2005)

@incollection{Whitaker.2005,
 author = {Whitaker, Robert J.},
 title = {Types of Two-Dimensional Pendulums and Their Uses in Education},
 pages = {377-391},
 publisher = {Springer},
 isbn = {9781402035265},
 editor = {Matthews, Michael R and Gauld, Colin F and Stinner, Arthur},
 booktitle = {The Pendulum: Scientific, Historical, Philosophical and Educational Perspectives},
 year = {2005},
 address = {Dordrecht}
}