The BPR - Bibliography of the Italian Parliament and Electoral Studies, edited by the Library of the Chamber of Deputies, reports publications concerning the Italian Parliament, the Consulta, the Constituent Assembly and the parliamentary elections since 1848. A part of the bibliographical references is enriched by the complete texts. Each citation is assigned one or more classification codes based on a scheme of over 100 classes organized in seven large areas. For the RDF modelling of the data it was decided to reuse ontologies for the bibliographic description already widespread internationally such as the Bibliographic Ontology (BIBO), the International Standard Bibliographic Description (ISBD) Ontology and Dublin Core Vocabulary. The classification scheme has been converted to SKOS format.