Stata Corporation. (1985). Stata cross-sectional time series: Reference manual release 8. Stata Corporation.
Cita Chicago (17th ed.)Stata Corporation. Stata Cross-sectional Time Series: Reference Manual Release 8. College Station, Tex: Stata Corporation, 1985.
Cita MLA (9th ed.)Stata Corporation. Stata Cross-sectional Time Series: Reference Manual Release 8. Stata Corporation, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.