An API client for the 'Wikidata Query Service' <https://query.wikidata.org/>.
Building a SPARQL query: Museums on Instagram
SPARQL Query Examples for WDQS
Using SPARQL to access Linked Open Data by Matthew Lincoln
Interesting or illustrative SPARQL queries for Wikidata
Wikidata 2016 SPARQL Workshop
Wikidata SPARQL Query video tutorial by Navino Evans
Learning SPARQL by Bob DuCharme
Quick intro to WDQS & SPARQL from my Cascadia R Conference 2017 talk
Wikidata Query Service is maintained by the Wikimedia Foundation.
Useful links: