APA

National Bureau of Economic Research, . (19721972). Exploratory report / National Bureau of Economic Research. New York, NY: Columbia University Press.

Chicago

National Bureau of Economic Research, . 19721972. Exploratory report / National Bureau of Economic Research. New York, NY: Columbia University Press.

Harvard

National Bureau of Economic Research, . (19721972). Exploratory report / National Bureau of Economic Research. New York, NY: Columbia University Press.

MLA

National Bureau of Economic Research, . Exploratory report / National Bureau of Economic Research. New York, NY: Columbia University Press. 19721972.