Of course, if you are writing about a particular interface, you can also refer to the documentation for those products. 'The correct bibliographic citation for this manual is as follows: SAS Institute Inc. For example, the SAS/IML 14.1 User's Guide has the following sentence: You can find the correct bibliographic citation in the PDF version of the documentation, on the page after the title page.

In a bibliography, the typical reference is to the documentation. 'We computed the descriptive statistics by using the MEANS procedure in SAS 9.4 software.' 'We implemented the algorithm by using the IML procedure in SAS/IML 14.1 software.' If you are trying to document an underlying statistical procedure, most researchers refer to the underlying version of SAS or SAS/STAT (ETS, IML, OR.) software.