How to reference field with spaces in name

Hi,

i have the following query: -

let
Source = OData.Feed("https://NAME.sharepoint.com/sites/pol/SUBSITENAME/_api/web/lists/GetByTitle('Issues')/Items()?$Select=Title,Priority", null, [Implementation="2.0"])
in
Source

The current query selects the fields Title,Priority. I wish to add a field that has spaces within its name (e.g. "field with spaces"). How do i reference such a field as this in M?

I have tried 

"field with spaces"

'field with spaces'

[field with spaces]

issues[field with spaces]

"field%20with%20spaces"

with no luck...