Wikisource:Wikidata/Maintenance/Authors without Wikipedia articles

SELECT ?item ?ws ?itemLabel ?itemDescription 
{
    ?item wdt:P31 wd:Q5 .
    [] schema:about ?item; schema:isPartOf <https://en.wikisource.org/>; schema:name ?ws .
    MINUS { [] schema:about ?item; schema:isPartOf <https://en.wikipedia.org/> }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}

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Note

The above query is limited to the English Wikipedia