APA (7e ed.) Bronvermelding

Não informado. (1946). Instrument practice. United Trade Press.

Chicago (17e ed.) Bronvermelding

Não informado. Instrument Practice. London: United Trade Press, 1946.

MLA (8e ed.) Bronvermelding

Não informado. Instrument Practice. United Trade Press, 1946.

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