What is the {human} for {doctoral advisor} of {B. F. Skinner}
Who is the specialist of B. F. Skinner ?
Who is the doctor of B. F. Skinner ?
SELECT DISTINCT ?r WHERE { ?r rdf:type ontology:human . ?r property:doctoral_advisor resource:B._F._Skinner }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P184> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q213195> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5> } 
 select distinct ?sbj where { ?sbj wdt:P184 wd:Q213195 . ?sbj wdt:P31 wd:Q5 } 
Richard Herrnstein William Kaye Estes