APA reference list example: Data set or graphic representation. The author is listed by government department and agency: U period S period Department of Agriculture, Economic Research Service. The year is listed in parentheses, followed by a period: (2009). The title is italicized and is followed by no punctuation: Eating and health module (ATUS): 2007 data The label is listed in brackets, followed by a period: [Data set]. The words “Retrieved from” are followed by the URL, with no period at the end: http://www.ers.usda.gov/Data/ATUS/Data/2007/2007data.htm