"Playthings," Bulletin No. I.
"The Play School," Bulletin No. III.
"The Children's School, The Teachers College Playground, The
Gregory School," Bulletin No. IV.
Bureau of Educational Experiments publications, 1917.
Chambers, Will Grant and others
"Report of the Experimental Work in the School of Childhood,"
University of Pittsburgh Bulletin, 1916.
Cook, H. Caldwell
"The Play Way," Stokes Co., 1917.
Corbin, Alice M.
"How to Equip a Playroom: the Pittsburgh Plan," Bulletin No. 118,
Playground and Recreation Association of America, 1913.
Dewey, John and Evelyn
"Schools of To-morrow," Dutton, 1915.
Chap. V, "Play."
Hall, G. Stanley