APA (7th ed.) Citation

Middleton, S. E., Shadbolt, N. R., & De Roure, D. C. Ontological user profiling in recommender systems. ACM transactions on information systems..

Chicago Style (17th ed.) Citation

Middleton, Stuart E., Nigel R. Shadbolt, and David C. De Roure. "Ontological User Profiling in Recommender Systems." ACM Transactions on Information Systems. .

MLA (9th ed.) Citation

Middleton, Stuart E., et al. "Ontological User Profiling in Recommender Systems." ACM Transactions on Information Systems., .