What is the {author} and the {cover artist} of {Treasure_Island} ?
Who wrote & Illustrated the book Treasure Island?
Who is the author of and who illustrated the cover of Treasure Island?
SELECT ?m ?s WHERE { resource:Treasure_Island property:author ?m . resource:Treasure_Island property:cover_art_by ?s }
 SELECT ?ans_1 ?ans_2 WHERE { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q185118> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P50> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?ans_1. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q185118> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P736> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?ans_2. } 
SELECT ?ans_1 ?ans_2 WHERE { wd:Q185118 wdt:P50 ?ans_1 . wd:Q185118 wdt:P736 ?ans_2 }
Robert Louis Stevenson N. C. Wyeth Robert Louis Stevenson Louis Rhead