This thread is for gathering relevant articles, references and other useful links in one place. Please, when posting links remember to add a short description of the link as well. You can obviously also post links to other threads as well but if the link has longer term relevance, let's add it here as well. I'll start by posting few of my favourite references and articles: Civ4 BtS Reference guide by dj_anion A comprehensive reference of practically everything in BtS. IMO, the best there is. Game Mechanics articles in War Academy Practically every article is good reading material. I'd like to highlight these articles on mechanics of research and demographics.