Assertion: source's material | /r/HasProperty | challenged
Facets:
Source sentences:
text: Any material that is challenged or likely to be challenged must be supported by a reliable source.
text: Any material that is challenged or likely to be challenged must be supported by a reliable source.
text: The policy says that all material challenged or likely to be challenged, and all quotations, needs a reliable source; what counts as a reliable source is described at WP: