Category:Language articles with unreferenced extinction date Source: en.wikipedia.org/wiki/Category:Language_articles_with_unreferenced_extinction_date

This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories. This is a hidden category. It is not shown on its member pages, unless the corresponding user preference (Appearance → Show hidden categories) is set.

This category is triggered by the language infobox if there is a value for 'extinction' (other than "?") or for 'era' and there is no ref field.

All checked against Linguist List 2015-3-24.