1. P. Clark, J. Thompson and B. Porter, “Knowledge patterns,” in Handbook on Ontologies, edited by S. Staab and R. Studer (Springer-Verlag, Berlin, 2004). pp. 191–207. ISBN 3-540-40834-7.
2. A. Lukasová, M. Vajgl and M. Žáček, “Reasoning in RDF graphic formal system with quantifier”. Proceedings of the International Multiconference on Computer Science and Information Technology. (Wisla, Poland, 2010). pp. 67–72. ISBN 978-83-60810-22-4.
3. S. Staab, M. Erdmann, A. Maedche and S. Decker, “Ontologies in RDF(S)”, [online] http://www.ida.liu.se/ext/etai/received/semaweb/010/paper.pdf.
4. W3C: Resource Description Framework (RDF): Concepts and Abstract Syntax, http://www.w3.org/TR/2004/REC-rdf-concepts-20040210/
5. W3C: RDF Primer, http://www.w3.org/TR/2004/REC-rdf-primer-20040210/