Hi Gabriel, its Gabriel :) 

If the query service is timing out on you and you'd like to work with a raw Wikidata JSON dump, you might find this package I've been working on useful.  

https://qwikidata.readthedocs.io/en/stable/index.html

You could use it to pull out all of the reference/source statements. There is an example of accessing references in the "entity" section of the docs, 

 https://qwikidata.readthedocs.io/en/stable/entity.html

On Mon, Jan 20, 2020 at 12:52 PM James Heald <jpm.heald@gmail.com> wrote:

On 20/01/2020 14:19, Nicolas VIGNERON wrote:
> Le lun. 20 janv. 2020 à 14:14, Eugene Alvin Villar <seav80@gmail.com> a
> écrit :
>
>> On Mon, Jan 20, 2020, 9:06 PM Nicolas VIGNERON, <
>> vigneron.nicolas@gmail.com> wrote
>>
>>> In a nutshell, you can safely assume that only the property 'stated in'
>>> matters.
>>>
>>
>> I think 'inferred from' (P3452) should also be considered as an internal
>> reference.
>>
>
> Probably but this property is not often used.
>
> I managed to make a query work: https://w.wiki/FqH (number of use of the 76
> properties used in the references space for items located in Paris, the
> last part is to have a small sample and avoid timeout ; also, maybe the
> SPARQL code could be optimized, I just wanted to have an overview and
> confirm my assumption that only a few property are widely used)
>

Here's a version of the query with labels for the properties, making its
output a bit more readable:
     https://w.wiki/Fr9

Note that for external references, it's very common just to give the
identifier in the external database, via the appropriate property
(perhaps accompanied by a "retrieved" = <date>, but usually not.

   -- James.

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