APA (7th ed.) Citation

Xu, C., & Sui, D. Z. (2011). Exploring Volunteered Geographic Information (VGI) for Emergency Management: Toward a Wiki GIS Framework.

Chicago Style (17th ed.) Citation

Xu, Chen, and Daniel Z. Sui. Exploring Volunteered Geographic Information (VGI) for Emergency Management: Toward a Wiki GIS Framework. 2011.

MLA (8th ed.) Citation

Xu, Chen, and Daniel Z. Sui. Exploring Volunteered Geographic Information (VGI) for Emergency Management: Toward a Wiki GIS Framework. 2011.

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