APA引文

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

Trích dẫn kiểu Chicago

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

MLA引文

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

警告：这些引文格式不一定是100％准确.