APA (7th ed.) Citation

Shekhar, S., Xiong, H., & Zhou, X. (2017). Encyclopedia of GIS. Springer.

Chicago Style (17th ed.) Citation

Shekhar, Shashi, Hui Xiong, and Xun Zhou. Encyclopedia of GIS. Cham: Springer, 2017.

MLA (9th ed.) Citation

Shekhar, Shashi, et al. Encyclopedia of GIS. Springer, 2017.