Question: Who was the cover artist of The Adventure of Tom Sawyer also wrote mark Twain Tonight ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/The_Adventures_of_Tom_Sawyer> <http://dbpedia.org/ontology/coverArtist> ?uri. <http://dbpedia.org/resource/Mark_Twain_Tonight> <http://dbpedia.org/property/writer> ?uri}