1. Dataset- online

Investigators. (Year). Title of dataset - italicised [Description of format or type]. Retrieved from http://www.xxxxxx

Example:

Pew Hispanic Center. (2004). Changing channels and crisscrossing cultures: A survey of Latinos on the news media [Data file and code book]. Retrieved from http://pewhispanic.org/datasets/

2. Dataset with DOI 

Investigators. (Year). Title of dataset - italicised [Description of format or type]. doi:xx.xxxxxx

Example:

Wong, K. K., & Langevin, W. E. (2007). Policy expansion of school choice in the American states, 1991-2005 [Dataset]. doi:10.3886/ICPSR20427.v1