APA (7th ed.) Citation

Environmental Systems Research Institute (Redlands, Calif.), & Perencsik, A. (2004). ArcGIS 9. ESRI.

Chicago Style (17th ed.) Citation

Environmental Systems Research Institute (Redlands, Calif.), and Andrew Perencsik. ArcGIS 9. Redlands, CA: ESRI, 2004.

MLA (9th ed.) Citation

Environmental Systems Research Institute (Redlands, Calif.), and Andrew Perencsik. ArcGIS 9. ESRI, 2004.

Warning: These citations may not always be 100% accurate.