Spalding, M. W. (1950). A guide for nature teaching in camps, schools and homes. Madison College.
Citazione stile Chigago Style (17a edizione)Spalding, Muad W. A Guide for Nature Teaching in Camps, Schools and Homes. Madison College, 1950.
Citatione MLA (9a ed.)Spalding, Muad W. A Guide for Nature Teaching in Camps, Schools and Homes. Madison College, 1950.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.