SAS Institute Content Provider, Institute, S., & SAS Institute Contributor. (2013). Step-By-Step Programming with Base SAS 9. 4. SAS Institute.
Cita Chicago Style (17a ed.)SAS Institute Content Provider, SAS Institute, y SAS Institute Contributor. Step-By-Step Programming with Base SAS 9. 4. [Place of publication not identified]: SAS Institute, 2013.
Cita MLA (9a ed.)SAS Institute Content Provider, et al. Step-By-Step Programming with Base SAS 9. 4. SAS Institute, 2013.
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