APA
National Recreation Association United States, National Recreation Association United States, . (1938). New play areas their design and equipment. : .
Chicago
National Recreation Association United States, National Recreation Association United States, . 1938. New play areas their design and equipment. : .
Harvard
National Recreation Association United States, National Recreation Association United States, . (1938). New play areas their design and equipment. : .
MLA
National Recreation Association United States, National Recreation Association United States, . New play areas their design and equipment. : . 1938.
