APA-viite (7. p.)

Calì, A., Gottlob, G., Lukasiewicz, T., & Paredaens, J. (2009). A general datalog-based framework for tractable query answering over ontologies. ACM.

Chicago-viite (17. p.)

Calì, A., G. Gottlob, T. Lukasiewicz, ja J. Paredaens. A General Datalog-based Framework for Tractable Query Answering over Ontologies. ACM, 2009.

MLA-viite (9. p.)

Calì, A., et al. A General Datalog-based Framework for Tractable Query Answering over Ontologies. ACM, 2009.