Sergei Nirenburg; H. L. Somers; Yorick Wilks (2003). Readings in Machine Translation. Cambridge, MA: MIT Press. pp. 371–. ISBN 978-0-262-14074-4. 978-0-262-14074-4 ↩
Blackburn, P., and Bos, J. (2005), Representation and Inference for Natural Language: A First Course in Computational Semantics, Stanford, CA: CSLI Publications. ISBN 1-57586-496-7. /wiki/CSLI_Publications ↩