APA (7th ed.) Citation

V. N., R. (2012). Everything you need to know about XML document type definitions (DTDs). BrainMass Inc..

Chicago Style (17th ed.) Citation

V. N., Rao. Everything You Need to Know About XML Document Type Definitions (DTDs). [Newmarket, Ontario]: BrainMass Inc., 2012.

MLA (8th ed.) Citation

V. N., Rao. Everything You Need to Know About XML Document Type Definitions (DTDs). BrainMass Inc., 2012.

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