SPARQL Query Fail: SELECT FROM

Question

I wanted to try out some of the examples in this article, but I get very inconsistent results depending on the SPARQL Query Processor I'm using. I have tried out the most basic example:

SELECT DISTINCT ?p
FROM <http://worldcat.org/entity/work/id/67201841>
WHERE
  { ?s ?p ?o.
  } 

This works with http://sparql.org/sparql.html, but fails with all the other processors I have tried such as http://sparql-playground.sib.swiss/, https://dbpedia.org/sparql etc. These all produce no result. https://query.wikidata.org/ produces an error Unknown error: NAMED clauses in queries are not supported in triples mode.

Could anyone explain why this query fails?