Allen Ray, A. (1982). SAS user's guide: Statistics 1982 edition. Sas Institute.
Cita Chicago (17th ed.)Allen Ray, Alice. SAS User's Guide: Statistics 1982 Edition. Sas Institute, 1982.
Cita MLA (9th ed.)Allen Ray, Alice. SAS User's Guide: Statistics 1982 Edition. Sas Institute, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.