Cita APA (7th ed.)

SAS Institute & Helwig, J. T. (1983). SAS introductory guide (Rev. ed.). SAS Institute.

Cita Chicago (17th ed.)

SAS Institute i Jane T. Helwig. SAS Introductory Guide. Rev. ed. Cary, N.C: SAS Institute, 1983.

Cita MLA (9th ed.)

SAS Institute i Jane T. Helwig. SAS Introductory Guide. Rev. ed. SAS Institute, 1983.