APA (7th ed.) Citation

De Castro Lopo, E., Aitken, P., & Jones, B. L. (2000). Sams teach yourself C for Linux Programming in 21 days. Sams.

Chicago Style (17th ed.) Citation

De Castro Lopo, Erik, Peter Aitken, and Bradley L. Jones. Sams Teach Yourself C for Linux Programming in 21 Days. Indianapolis, IN: Sams, 2000.

MLA (8th ed.) Citation

De Castro Lopo, Erik, et al. Sams Teach Yourself C for Linux Programming in 21 Days. Sams, 2000.