Cita APA (7a ed.)
Vella, F. (Winter98). Estimating models with sample selection bias: A survey. Journal of Human Resources, 33(1), 127-170.
Cita Chicago Style (17a ed.)
Vella, Francis. "Estimating Models with Sample Selection Bias: A Survey." Journal of Human Resources 33, no. 1 (Winter98): 127-170.
Cita MLA (9a ed.)
Vella, Francis. "Estimating Models with Sample Selection Bias: A Survey." Journal of Human Resources, vol. 33, no. 1, Winter98, pp. 127-170.
Precaución: Estas citas no son 100% exactas.