APA (7th ed.) Citation

Wilkinson, L., Hill, M. A., & Vang, E. (1992). Systat: Graphics. Systat.

Chicago Style (17th ed.) Citation

Wilkinson, Leland, Mary Ann Hill, and Erin Vang. Systat: Graphics. Evanston: Systat, 1992.

MLA (9th ed.) Citation

Wilkinson, Leland, et al. Systat: Graphics. Systat, 1992.