I have pulled together, for some inspiration, identity guidelines of 100 Best Global Brands of 2016 by Interbrand. The list consist of style guides, brand books, visual identity guidelines, brand usage guidelines or however you choose to call them. All kind of documents that specify on how to use their logos and brand other brand assets. I hope it will give you an insight into the wide world of branding and marketing.
100 Best Global Brands of 2016 and their guidelines: