APA (7th ed.) Citation

Environmental Systems Research Institute (Redlands, Calif.). (1990). Understanding GIS : the ARC/INFO method /: The ARC/INFO method /. Environmental Systems Research Institute.

Chicago Style (17th ed.) Citation

Environmental Systems Research Institute (Redlands, Calif.). Understanding GIS : The ARC/INFO Method /: The ARC/INFO Method /. Redlands, CA: Environmental Systems Research Institute, 1990.

MLA (9th ed.) Citation

Environmental Systems Research Institute (Redlands, Calif.). Understanding GIS : The ARC/INFO Method /: The ARC/INFO Method /. Environmental Systems Research Institute, 1990.

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