② 选择来源: 要找到足够的文献材料来进行工作. 这个阶段, 重点是区分不同类型的来源, 并找到有效信息. 来源一般有两种. Appraise how other Students have approached your subject. Detect authoritative resources or will work that happen to be accepted as A very powerful accounts of the subject matter. �