APA (7th ed.) Citation

Liu, X., Ren, Z., Chang, X., Gao, H., & Aickelin, U. (2010). Draw a line on your PDA to authenticate.

Chicago Style (17th ed.) Citation

Liu, Xiyang, Zhongjie Ren, Xiuling Chang, Haichang Gao, and Uwe Aickelin. Draw a Line on Your PDA to Authenticate. 2010.

MLA (9th ed.) Citation

Liu, Xiyang, et al. Draw a Line on Your PDA to Authenticate. 2010.