APA (7th ed.) Citation

Zhou, S. K., Chellappa, R., & Zhao, W. (2006). Unconstrained Face Recognition. Springer US.

Chicago Style (17th ed.) Citation

Zhou, Shaohua Kevin, Rama Chellappa, and Wenyi Zhao. Unconstrained Face Recognition. Boston, MA: Springer US, 2006.

MLA (8th ed.) Citation

Zhou, Shaohua Kevin, et al. Unconstrained Face Recognition. Springer US, 2006.