Question: What book did Niccolo Machiavelli write which has the ISBN of 9780140447521?
Answer(s):
answer: The Prince

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.05cvs)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.05cvs ns:book.author.book_editions_published ?x .
?x ns:media_common.cataloged_instance.isbn13 "9780140447521" . 
}