Cita APA (7a ed.)
Langbein, L. (Winter2009). Beyond Random Assignment for Internal Validity and Beyond Social Research for Random Assignment. Journal of Policy Analysis & Management, 28(1), 173-175.
Cita Chicago Style (17a ed.)
Langbein, Laura. "Beyond Random Assignment for Internal Validity and Beyond Social Research for Random Assignment." Journal of Policy Analysis & Management 28, no. 1 (Winter2009): 173-175.
Cita MLA (9a ed.)
Langbein, Laura. "Beyond Random Assignment for Internal Validity and Beyond Social Research for Random Assignment." Journal of Policy Analysis & Management, vol. 28, no. 1, Winter2009, pp. 173-175.
Precaución: Estas citas no son 100% exactas.