APA Citation

 Helbig, H. (2006).  Knowledge representation and the semantics of natural language.  Springer.

Chicago Style Citation

 Helbig, Hermann.  Knowledge Representation and the Semantics of Natural Language.  Springer, 2006.

MLA Citation

 Helbig, Hermann.  Knowledge Representation and the Semantics of Natural Language.  Springer, 2006.

Warning: These citations may not always be 100% accurate.