Statistics
Gordis, L. (1996). Epidemiology. Philadelphia, PA: W.B. Saunders Company.
Norman, G.R., & Streiner, D.L. (1986). PDQ statistics. Toronto, ON: B.C. Decker, Inc.
Streiner, D.L., Norman, G.R., Monroe Blum, H. (1989). PDQ epidemiology. Toronto, ON: B.C. Decker, Inc.


