by Wittberg, Richard A, Northrup, Karen L, Cottrell, Lesley A
Published in American journal of public health (1971) (01.12.2012)

by Cottrell, Lesley, PhD, Northrup, Karen, RN, Wittberg, Richard, PhD
Published in American journal of preventive medicine (01.03.2017)

by Cottrell, Lesley A., Northrup, Karen, Wittberg, Richard
Published in Obesity (Silver Spring, Md.) (01.12.2007)

by Rugless, Fedoria, Bhattacharya, Amit, Succop, Paul, Dietrich, Kim N, Cox, Cyndy, Alden, Jody, Kuhnell, Pierce, Barnas, Mary, Wright, Robert, Parsons, Patrick J, Praamsma, Meredith L, Palmer, Christopher D, Beidler, Caroline, Wittberg, Richard, Haynes, Erin N
Published in Neurotoxicology and teratology (01.01.2014)

by Wittberg, Richard A., Northrup, Karen L., Cottrel, Lesley
Published in American journal of health education (01.01.2009)

by Northrup, Karen L, Cottrell, Lesley A, Wittberg, Richard A
Published in The Journal of school nursing (01.02.2008)

by Northrup, Karen L., Cottrell, Lesley A., Wittberg, Richard A.
Published in The Journal of school nursing (01.02.2008)

by Crespo, Richard, Christiansen, Matthew, Tieman, Kim, Wittberg, Richard
Published in Preventing chronic disease (13.02.2020)

by Haynes, Erin N., Beidler, Caroline, Wittberg, Richard, Meloncon, Lisa, Parin, Megan, Kopras, Elizabeth J., Succop, Paul, Dietrich, Kim N.
Published in Environmental health perspectives (01.10.2011)

by O'Hara Tompkins, Nancy, Weikle, Mary Foltz, Keath, Adam, Northrup, Karen, Childers, Susan, Grant, Josh, Sirk, Hannah, Wittberg, Richard
Published in Journal of physical education, recreation & dance (22.11.2019)

by Law, Jennifer, Northrup, Karen, Wittberg, Richard, Lilly, Christa, Cottrell, Lesley
Published in The Journal of school nursing (01.12.2013)

by Wittberg, Richard, Cottrell, Lesley A., Davis, Catherine L., Northrup, Karen L.
Published in American journal of health education (01.09.2010)