The proof is in the eating: subjective peer norms are associated with adolescents' eating behaviour.
Stok FM, de Vet E, de Wit JB, Luszczynska A, Safron M, de Ridder DT. The proof is in the eating: subjective peer norms are associated with adolescents' eating behaviour. Public Health Nutr. 2015 Apr; 18(6):1044-51.