StataCorp LP. (2007). Stata user's guide: Release 10. StataCorp LP.
Cita Chicago (17th ed.)StataCorp LP. Stata User's Guide: Release 10. College Station, Tex: StataCorp LP, 2007.
Cita MLA (9th ed.)StataCorp LP. Stata User's Guide: Release 10. StataCorp LP, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.