1. Basic stage:
History of Western Philosophy, Sophie's World, History of China's Philosophy, Notes on Philosophy, etc.
2. Promotion stage:
Three Criticism by Kant, original works by Hegel, Feuerbach, Marx, Heidegger and Nietzsche. Specific Baidu search.
3. Easy reading after class:
Books with cultural colors that introduce various ideas. Chrysanthemum and Knife about Japanese culture and so on.