Why children and young animals play : a new theory of play and its role in problem solving

MLA

Petersen, Arne Friemuth. Why Children and Young Animals Play : a New Theory of Play and Its Role In Problem Solving. Copenhagen: Royal Danish Academy of Sciences and Letters , 1988.

APA

Petersen, A. Friemuth. (1988). Why children and young animals play : a new theory of play and its role in problem solving. Copenhagen: Royal Danish Academy of Sciences and Letters .

Chicago

Petersen, Arne Friemuth Why Children and Young Animals Play: A New Theory of Play and Its Role In Problem Solving. Copenhagen: Royal Danish Academy of Sciences and Letters, 1988.