Style de citation APA

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

Style de citation Chicago

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

Style de citation MLA

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

Attention : ces citations peuvent ne pas être correctes à 100%.