[[ISO Standard]]

[http://ncorwiki.buffalo.edu/index.php/BFO_Release_History BFO Release History]

[http://ncorwiki.buffalo.edu/index.php/Basic_Formal_Ontology_2.0 BFO 2.0]

[http://ncorwiki.buffalo.edu/index.php/BFO_2020 BF0 2020]