Ball, K., A. MacFarlane, and D. Crawford (2009), "Can social cognitive theory constructs explain socio-economic variations in adolescent eating behaviours? A mediation analysis", Health Education Research, 24, 496-506.
- Observation of eating behavior of adolescent's best friend.
My best friend eats healthy food.
My best friend limits junk foods.
My best friend eats vegetables most days.
My best friend eats fruit most days.