APA (7e ed.) Bronvermelding

Não informado. (1981). Systems and control letters. Elsevier Science Publishers.

Chicago (17e ed.) Bronvermelding

Não informado. Systems and Control Letters. Amsterdam: Elsevier Science Publishers, 1981.

MLA (8e ed.) Bronvermelding

Não informado. Systems and Control Letters. Elsevier Science Publishers, 1981.

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