David Ahn

Ongoing physical activity advice by humans versus computers: the Community Health Advice by Telephone (CHAT) trial.

Robert Friedman, Abby C King, A. King, 2007, Health psychology : official journal of the Division of Health Psychology, American Psychological Association.

Perceived environments as physical activity correlates and moderators of intervention in five studies.

James F Sallis, Abby C King, Deborah Riebe, 2006, American journal of health promotion : AJHP.

Identifying subgroups that succeed or fail with three levels of physical activity intervention: the Activity Counseling Trial.

Andrea L Dunn, James F Sallis, W Jack Rejeski, 2006, Health psychology : official journal of the Division of Health Psychology, American Psychological Association.

Are daily fluctuations in perceived environment associated with walking?

Matthew P. Buman, Eric B. Hekler, Audie A. Atienza, 2012, Psychology & health.