MLA

Helbig, Hermann, Dov M Gabbay, and Jörg Siekmann. Knowledge Representation and the Semantics of Natural Language. Springer Berlin Heidelberg, 2006.

APA

Helbig, H., Gabbay, D. M, & Siekmann, J. (2006). Knowledge Representation and the Semantics of Natural Language. Springer Berlin Heidelberg.

Chicago

Helbig, Hermann, Dov M Gabbay, and Jörg Siekmann. Knowledge Representation and the Semantics of Natural Language. : Springer Berlin Heidelberg, 2006.