Cite an IBISWorld report as in the following example. APA says to include a report number, if given, in parentheses after the title. Example:
Brennan, A. (2014). Single location full-service restaurants in the US (Industry Report 72211b). Retrieved January 28, 2015, from IBISWorld database.
Mintel Reports:
Wall, B. (2014). Full service restaurants – US. Retrieved January 28, 2015, from Mintel Academic database.
Notice that unlike IBISWorld, Mintel does not provide report numbers.
U.S. Census Bureau:
U.S. Census Bureau. (2015). State & county quickfacts: Berks County, Pennsylvania. Retrieved January 28, 2015, from http://quickfacts.census.gov/qfd/states/42/42011.html