Spalding, M. W. (1950). A guide for nature teaching in camps, schools and homes. Madison College.
芝加哥风格引文Spalding, Muad W. A Guide for Nature Teaching in Camps, Schools and Homes. Madison College, 1950.
MLA引文Spalding, Muad W. A Guide for Nature Teaching in Camps, Schools and Homes. Madison College, 1950.
警告：这些引文格式不一定是100％准确.