Klepeis, Neil E, William C Nelson, Wayne R Ott, John P Robinson, Andy M Tsang, Paul Switzer, Joseph V Behar, Stephen C Hern, and William H Engelmann. "The National Human Activity Pattern Survey (NHAPS): A Resource for Assessing Exposure to Environmental Pollutants." Journal of Exposure Analysis and Environmental Epidemiology 11 (2001) 231–252.PDF DOI | Google Scholar | BibTeX | Endnote tagged