The "chronology source needed" link you just followed was placed there because a Wikipedia editor feels that either the preceding statement is likely to be challenged and therefore needs an inline citation that confirms the timeline claim if there is one, or that the statement lacks a timeline or chronology of reference and therefore needs an inline citation providing dates or timelines to validate the statement. If you can provide a source as explained, please be bold and add it. If not, please exercise extra caution when using the flagged information.
Examples
In the statement "that organization was founded in 1978 when the natural disasters had increased...", inserting {{Timefact}} will show the need for a source that specifies when the disasters increased in relation with the year of foundation.
In the statement "those celtic tribes survived more than one invasion...", placing {{Timefact}} shows the need for a source that says when that happened.
Getting back to the article
If you wish to change or discuss the article which sent you here:
Use your web browser's "Back" button to return to the article's page.
At the top of the article's page (not this page):
Use the "Edit this page" tab to improve the article
Use the "Discussion" tab to discuss with others how to improve the article
Why cite sources?
Verifiability is one of Wikipedia's most fundamental policies
Reliable sources explains what constitutes a reliable source for Wikipedia