Hersey JC, Wohlgenant KC, Arsenault J, Kosa KM, Muth MK. Effects of front-of-package and shelf nutrition labeling systems on consumers. Nutr Rev. 2013 Jan;71(1):1-14. doi: 10.1111/nure.12000
Parsley (Edwards) TL. Review of the phantom respondents: opinion surveys and political representation. J Off Stat. 1994;10(3):351-5.