Retherford, R. D., & Choe,Minja Kim. (1993). Statistical models for causal analysis. John Wiley &Sons.
Dyfyniad Arddull ChicagoRetherford, Robert D., and Choe,Minja Kim. Statistical Models for Causal Analysis. New York: John Wiley &Sons, 1993.
Dyfyniad MLARetherford, Robert D., and Choe,Minja Kim. Statistical Models for Causal Analysis. John Wiley &Sons, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.