Stata Corporation. (2011). STATA release 12: Data analysis and statistical software (Version 12.). Stata Corp LP.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रStata Corporation. STATA Release 12: Data Analysis and Statistical Software. Version 12. College Station, Texas: Stata Corp LP, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रStata Corporation. STATA Release 12: Data Analysis and Statistical Software. Version 12. Stata Corp LP, 2011.
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