1. Antoniou, G. and van Harmelen, F. A semantic Web primer. Cambridge, MA: MIT Press, 2004. pp. 238: This book is a good introduction to Semantic Web languages.
2. Shelley Powers, Practical RDF, O’Reilly, 2003, pp. 331: This book covers RDF, RDFS, and OWL. It provides a good source of information for those interested in programming with RDF with Perl, PHP, Java, and Python.
3. Seffen Staab, Ontology Handbook, Springer, 2003, pp. 499: This book covers provides a good introduction to Description Logics and OWL.
4. OWL Overview-http://www.w3.org/TR/owl-featured
5. OWL Reference-http://www.w3.org/TR/owl-ref/