Não informado. (1970). Working paper series. National Bureau of Economic Research.
Style de citation Chicago (17e éd.)Não informado. Working Paper Series. Cambridge, Mass: National Bureau of Economic Research, 1970.
Style de citation MLA (8e éd.)Não informado. Working Paper Series. National Bureau of Economic Research, 1970.
Attention : ces citations peuvent ne pas être correctes à 100%.