APA

National Education Association, . (1943). Leadership at work. Washington: The Departmentof Supervisors and Directors of Instruction.

Chicago

National Education Association, . 1943. Leadership at work. Washington: The Departmentof Supervisors and Directors of Instruction.

Harvard

National Education Association, . (1943). Leadership at work. Washington: The Departmentof Supervisors and Directors of Instruction.

MLA

National Education Association, . Leadership at work. Washington: The Departmentof Supervisors and Directors of Instruction. 1943.