query: PREFIX wikibase: <http://wikiba.se/ontology#>
  PREFIX wd: <http://www.wikidata.org/entity/> 
  PREFIX wdt: <http://www.wikidata.org/prop/direct/>
  PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
  
  SELECT ?item ?itemLabel WHERE {
    ?item wdt:P31 wd:Q159979
    SERVICE wikibase:label {
      bd:serviceParam wikibase:language "en" .
    }
  } ORDER BY ?item