SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/publisher> <http://dbpedia.org/resource/Doubleday_(publisher)> . ?x <http://dbpedia.org/ontology/nonFictionSubject> ?uri . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Book>}
What non fiction subjects are covered in books by Doubleday publishers?
SELECT DISTINCT ?p WHERE { ?k rdf:type ontology:Book . ?k property:publisher resource:Doubleday_(publisher) . ?k property:non_fiction_subject ?p }
answer
The non-fiction subjects of the books published by Doubleday are [answer].
Non-fiction books published by Doubleday [answer].