Guarino N. Formal Ontology and Information Systems. In N. Guarino (ed.), Formal Ontology in Information Systems. Proc. of the 1st International Conference, Trento, Italy, 6-8 June 1998. IOS Press http://www.ladseb.pd.cnr.it/infor/Ontology/Papers/FOIS98.pdf 
Ontology, Conceptual Modeling, and Knowledge Engineering Group at: Institute for Systems Science and Biomedical Engineering of the Italian National Research Council (CNR), Padova, Italy http://www.ladseb.pd.cnr.it/infor/ontology/ontology.html 
SENSUS - 70,000-node terminology taxonomy. SENSUS je nastavak i reorganizacija WordNet –a (uključujući ostale ontologije povezane projektom ISI) http://mozart.isi.edu:8003/sensus2/ 
http://www.isi.edu/natural-language/projects/ONTOLOGIES.html