APA (7th ed.) Citation

Ahmad, M. N., M. Colomb, R., & Abd Wahid, M. T. (2006). A comparison of ontology servers.

Chicago Style (17th ed.) Citation

Ahmad, M. Nazir, Robert M. Colomb, and Mohd. Taib Abd Wahid. A Comparison of Ontology Servers. 2006.

MLA (9th ed.) Citation

Ahmad, M. Nazir, et al. A Comparison of Ontology Servers. 2006.