I think that the literature environment I was brought up in heavily shaped the way that I approach design. I've always leaned towards speculative-fiction, where events from the past, shape trajectories in the present, which in turn make projections which inform us about the future. In a way, these stories helped me to understand expectations and anticipations, which I believe translate well in design thinking. And then of course, there's some books that touch upon psychology, and others which discuss HCI principals in detail.