Brown, George W. (1982). "Standard Deviation, Standard Error: Which 'Standard' Should We Use?". American Journal of Diseases of Children. 136 (10): 937–941. doi:10.1001/archpedi.1982.03970460067015. PMID7124681..
Brown, George W. (1982). "Standard Deviation, Standard Error: Which 'Standard' Should We Use?". American Journal of Diseases of Children. 136 (10): 937–941. doi:10.1001/archpedi.1982.03970460067015. PMID7124681..