B. Tversky, J. Heiser, P. Lee, und M. Daniel. Spatial Language and Dialogue, Volume 3 von Explorations in language and space, Oxford University Press, (2009)
G. Shafer, und A. Tversky. Classic Works of the Dempster-Shafer Theory of Belief Functions, Volume 219 von Studies in Fuzziness and Soft Computing, Springer, (2008)