APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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