Cita APA (7a ed.)

University of Pennsylvania. Press, publisher, & Institute of Mathematical Statistics. (2015). Observational studies. Dylan Small.

Cita Chicago Style (17a ed.)

University of Pennsylvania. Press, publisher, y Institute of Mathematical Statistics. Observational Studies. [Place of publication not identified]: Dylan Small, 2015.

Cita MLA (9a ed.)

University of Pennsylvania. Press, publisher, y Institute of Mathematical Statistics. Observational Studies. Dylan Small, 2015.