Online:

A useful starting point regarding historical sources for North Uist is the local authority's Tasglann nan Eilean Siar page:
http://www.tasglann.org.uk/en/research-resources/source-lists/north-uist-source-list

Tobar an Dualchas is a searchable online resource of recordings and material including many from North Uist:
http://www.tobarandualchais.co.uk/

Island Voices - Guthan nan Eilean is a wonderful resource with many contributions from North Uist:
https://guthan.wordpress.com/

Hebridean Connections is a genealogical database which includes useful information regarding people, places, and many other aspects of island history and heritage: https://www.hebrideanconnections.com/

Am Baile​ is a searchable, bilingual website with photographs, illustrations, rare books, documents, short films, audio recordings and more about the history and culture of the Highlands and Islands: https://www.ambaile.org.uk/
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Books:

Perhaps the most comprehensive account is to be found in Erskine Beveridge's book North Uist which is available locally from the shop in Taigh Chearsabhagh. They can also supply it via their online store: https://www.taigh-chearsabhagh.org/shop/beveridge-erskine-north-uist-its-archaeology-and-topography/
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Bill Lawson, the Harris-based genealogist and local historian, has produced North Uist in History and Legend in addition to an ever-expanding collection of Croft Histories listing the people who lived here and their movements within and without the islands. These may be bought locally or online at: https://www.hebridespeople.com/shop/bill-lawson-publications/