APA (7e ed.) Bronvermelding

Não informado. (1970). Working paper series. National Bureau of Economic Research.

Chicago (17e ed.) Bronvermelding

Não informado. Working Paper Series. Cambridge, Mass: National Bureau of Economic Research, 1970.

MLA (8e ed.) Bronvermelding

Não informado. Working Paper Series. National Bureau of Economic Research, 1970.

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