APA (7th ed.) Citation

North, S., & Hermans, P. (1999). SAMS teach yourself XML in 21 days. SAMS.

Chicago Style (17th ed.) Citation

North, Simon, and Paul Hermans. SAMS Teach Yourself XML in 21 Days. Indianopolis: SAMS, 1999.

MLA (9th ed.) Citation

North, Simon, and Paul Hermans. SAMS Teach Yourself XML in 21 Days. SAMS, 1999.