SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/author> <http://dbpedia.org/resource/Carl_Sagan> . ?x <http://dbpedia.org/property/subject> ?uri . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Book>}
What has Carl Sagan written his books about?
SELECT DISTINCT ?d WHERE { ?j property:subject ?d . ?j rdf:type ontology:Book . ?j property:author resource:Carl_Sagan }
Human evolution, Intelligence, Evolutionary history of life, Relationship between religion and science, Extraterrestrial intelligence, Comets, Cosmos, Brain, Intellect, Paul Broca, Outline of space science
The subjects of the books authored by Carl Sagan are [Human evolution, Intelligence, Evolutionary history of life, Relationship between religion and science, Extraterrestrial intelligence, Comets, Cosmos, Brain, Intellect, Paul Broca, Outline of space science].
The topics of Carl Sagan's books are [Human evolution, Intelligence, Evolutionary history of life, Relationship between religion and science, Extraterrestrial intelligence, Comets, Cosmos, Brain, Intellect, Paul Broca, Outline of space science].
The subjects of the books whose written by is him are [Human evolution, Intelligence, Evolutionary history of life, Relationship between religion and science, Extraterrestrial intelligence, Comets, Cosmos, Brain, Intellect, Paul Broca, Outline of space science].
The subjects of the books he authored are [Human evolution, Intelligence, Evolutionary history of life, Relationship between religion and science, Extraterrestrial intelligence, Comets, Cosmos, Brain, Intellect, Paul Broca, Outline of space science].