APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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