Broadwell, M. M. (1975). The supervisor and on-the-job training (2nd ed.). Addison-Wesley.

Broadwell, Martin M. The Supervisor and On-the-job Training. 2nd ed. Reading: Addison-Wesley, 1975.

Broadwell, Martin M. The Supervisor and On-the-job Training. 2nd ed. Addison-Wesley, 1975.