How do I cite statistics?
Section 7.08 on Data Sets, Software, Measurement Instruments, and Apparatus has the appropriate rule for citing statistics. Rule #54 for a Data Set would be the rule to follow. Note that this category includes raw data and also tools that perform data analysis, so check the section thoroughly, depending on the type of information you are citing.
All information and page number references are based on the 6th edition of the Publication Manual of the American Psychological Association (2009/10).