Could anyone recommend serious academic sources that aren't just subjective garbage from amateur authors? I know how difficult it is to find sources on Celtic cosmology because everything is surrounded by "authors" with Wiccan neopagan garbage and women. We have some interesting sources on Irish paganism, preserved from the Middle Ages, but what do we know about Lusitanian and Celtiberian beliefs? Koch has some interesting books, but he doesn't focus precisely on mythology, but rather on etymologies. Iberian mythology isn't generally used much in the broader comparative mythology of IE, even Mallory and his books do not address the subject and even seem to ignore it