Warttig SL, Forshaw MJ, South J, White AK. New, normative, English-sample data for the Short Form Perceived Stress Scale (PSS-4). J Health Psychol. 2013 Dec;18(12):1617-28. doi: 10.1177/1359105313508346
Messiah SE, Lopez-Mitnik G, Winegar D, Sherif BN, Arheart KL, Reichard KW, Michalsky MP, Lipshultz SE, Miller TL, Livingstone AS, de la Cruz-Muñoz N. Effect of ethnicity on weight loss among adolescents 1 year after bariatric surgery. World J Diabetes. 2013 Oct 15;4(5):202-9. doi: 10.4239/wjd.v4.i5.202
French M, Neighbors D, Carswell L, Williams R, Bush L. A model for estimating industry compliance costs of food labeling regulations. Agribusiness: An International Journal. 1993;8(2):165-86.