Question: Which job of Irving Chernev is the non-fiction subject of the Thud ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Irving_Chernev> <http://dbpedia.org/ontology/occupation> ?uri. <http://dbpedia.org/resource/Thud!> <http://dbpedia.org/ontology/nonFictionSubject> ?uri}