APA

National Education Association, . (1945). Group planning in education. Washington: Department of Supervision and curriculum Development.

Chicago

National Education Association, . 1945. Group planning in education. Washington: Department of Supervision and curriculum Development.

Harvard

National Education Association, . (1945). Group planning in education. Washington: Department of Supervision and curriculum Development.

MLA

National Education Association, . Group planning in education. Washington: Department of Supervision and curriculum Development. 1945.