Cita APA (7a ed.)

Harder, C. (1999). Enterprise GIS for energy companies. ESRI.

Cita Chicago Style (17a ed.)

Harder, Christian. Enterprise GIS for Energy Companies. Redlands, CA: ESRI, 1999.

Cita MLA (9a ed.)

Harder, Christian. Enterprise GIS for Energy Companies. ESRI, 1999.