APA (7th ed.) Citation

Rosenbaum, P. R. (2002). Observational Studies (Second edition.). Springer New York.

Chicago Style (17th ed.) Citation

Rosenbaum, Paul R. Observational Studies. Second edition. New York, NY: Springer New York, 2002.

MLA (9th ed.) Citation

Rosenbaum, Paul R. Observational Studies. Second edition. Springer New York, 2002.