Bronze Age: Food – https://www.ancientcraft.co.uk/Archaeology/bronze-age/bronzeage_food.html
Celtic
Ancient Celtic Fare – http://www.foodtimeline.org/foodireland.html#celticfare
Celtic Food – http://www.primaryhomeworkhelp.co.uk/celts/food.html
Irish
A History of Irish Cuisine (Before and After the Potato) by John Linnane BSc, MSc. – http://www.ravensgard.org/prdunham/irishfood.html
Food in the Early Middle Ages, Celtic Ireland, Part I – http://www.markfisherauthor.com/2016/04/food-in-early-middle-ages/
Food in the Early Middle Ages, Celtic Ireland, Part II – http://www.markfisherauthor.com/2016/04/food-in-the-early-middle-ages-celtic-ireland-part-ii/
Diet in Viking-Age Ireland – https://dh.tcd.ie/clontarf/Diet%3A%20What%20Did%20People%20Eat%20in%20Viking-Age%20Ireland%3F
Excavations and Experiments in Ancient Irish Cooking-Places by Michael J. O’Kelly – https://www.jstor.org/stable/pdf/25509173.pdf?seq=1#page_scan_tab_contents
Fulachtaί Fia and Bronze Age Cooking in Ireland: Reappraising the Evidence by Alan Hawkes – https://www.jstor.org/stable/10.3318/priac.2015.115.13?seq=1#page_scan_tab_contents
Hot Property: the Morphology and Archaeology of the Irish Fulachta Fiadh by Emer Dennehy – http://www.kerryhistory.ie/documents/1.%20fulachtafiadh.pdf
Scandinavian
Archaeological Finds of Ninth- and Tenth-Century Viking Foodstuffs – https://www.cs.vassar.edu/~capriest/vikfood.html
Building and Using a Medieval-Style Hemispherical Bake Oven – https://www.cs.vassar.edu/~capriest/brikoven.html
Viking Food – http://www.primaryhomeworkhelp.co.uk/viking/food.html
Food in Iron Age Finland – http://www.katajahovi.org/en/ironage.html
Viking and Medieval Baking Instruments – http://www.katajahovi.org/en/instruments.html
Seeds and Roots of Wild Plants as an Extension of Flour – http://www.katajahovi.org/en/flour.html
Traditional and Medieval Bread Recipes – http://www.katajahovi.org/en/recipe.html
Viking Age Garden Plants from Southern Scandinavia – Diversity, Taphonomy and Cultural Aspects by Pernille Rohde Sloth, Ulla Lund Hansen & Sabine Karg – https://www.tandfonline.com/doi/full/10.1080/21662282.2012.750445
Food, Diet, and Nutrition in the Viking Age – http://www.hurstwic.org/history/articles/daily_living/text/food_and_diet.htm
Food in Viking Times by Vikingeskibsmuseet – https://www.vikingeskibsmuseet.dk/frontend/Dokumenter/Food_2_EN.pdf
A Viking Feast, an Abundance of Foods – https://www.ribevikingecenter.dk/en/learn-more/food/food-solstice-feast.aspx
Nordic Food is Viking Food – https://www.ribevikingecenter.dk/en/explore/the-viking-kitchen.aspx
An Early Meal a Viking Age Cookbook and Culinary Odyssey by Daniel. Hanna Tunberg Serra – https://www.amazon.com/Early-Viking-Cookbook-Culinary-Odyssey/dp/9198105604