Cita APA (7a ed.)

Wilhelms, F. T. (1973). Supervision in a new key. Association for Supervision and Curriculum Development.

Cita Chicago Style (17a ed.)

Wilhelms, Fred T. Supervision in a New Key. Washington: Association for Supervision and Curriculum Development, 1973.

Cita MLA (9a ed.)

Wilhelms, Fred T. Supervision in a New Key. Association for Supervision and Curriculum Development, 1973.