APA (7th ed.) Citation

Barro, R. J., & McCleary, R. M. (2004). Which countries have state religions? National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Barro, Robert J., and Rachel M. McCleary. Which Countries Have State Religions? Cambridge, Mass: National Bureau of Economic Research, 2004.

MLA (9th ed.) Citation

Barro, Robert J., and Rachel M. McCleary. Which Countries Have State Religions? National Bureau of Economic Research, 2004.