APA সাইটেশন

Hartley, R. E. (1952). Understanding children's Play. Columbia University Press.

শিকাগো স্টাইলে সাইটেশন

Hartley, Ruth E. Understanding Children's Play. New York: Columbia University Press, 1952.

এমএলএ সাইটেশন

Hartley, Ruth E. Understanding Children's Play. Columbia University Press, 1952.