APA (7th ed.) Citation

Safari Tech Books Online & Eckstein, R. A. (1999). XML pocket reference. O'Reilly.

Chicago Style (17th ed.) Citation

Safari Tech Books Online and Robert Author Eckstein. XML Pocket Reference. [Place of publication not identified]: O'Reilly, 1999.

MLA (9th ed.) Citation

Safari Tech Books Online and Robert Author Eckstein. XML Pocket Reference. O'Reilly, 1999.

Warning: These citations may not always be 100% accurate.