APA (7e ed.) Bronvermelding

Não informado. (1973). National Defense. American Defense Preparedness Association.

Chicago (17e ed.) Bronvermelding

Não informado. National Defense. Washington: American Defense Preparedness Association, 1973.

MLA (8e ed.) Bronvermelding

Não informado. National Defense. American Defense Preparedness Association, 1973.

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