You actually can't use Batman-On-Film as the source because they don't use permalinks to the individual stories. It's all just a big pile of stories on one page. Thus, if they post a bunch more stories, this one wouldn't be at the top for immediate viewing when you click there. So instead, in the future, just use the source before BOF (in this case IGN) and instead put BOF as the credit url so they at least get their credit.