APA (7th ed.) Citation

Stock, J. H., & Watson, M. W. (1998). Diffusion indexes. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Stock, James H., and Mark W. Watson. Diffusion Indexes. Cambridge: National Bureau of Economic Research, 1998.

MLA (9th ed.) Citation

Stock, James H., and Mark W. Watson. Diffusion Indexes. National Bureau of Economic Research, 1998.