APA (7e ed.) Bronvermelding

Não informado. (1926). Bulletin of the National Association of Secondary School Principals. National Association of Secondary School Principals.

Chicago (17e ed.) Bronvermelding

Não informado. Bulletin of the National Association of Secondary School Principals. Washington: National Association of Secondary School Principals, 1926.

MLA (8e ed.) Bronvermelding

Não informado. Bulletin of the National Association of Secondary School Principals. National Association of Secondary School Principals, 1926.

Let op: Deze citaties zijn niet altijd 100% accuraat.