What is the {human} for {author} of {Walden}
Who wrote Walden?
Who is the author of Walden?
SELECT DISTINCT ?q WHERE { resource:Walden property:author ?q . ?q rdf:type ontology:human }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q863534> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P50> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5> } 
 select distinct ?obj where { wd:Q863534 wdt:P50 ?obj . ?obj wdt:P31 wd:Q5 } 
Henry David Thoreau