APA (7th ed.) Citation

Costa, L. (2009). Esfinge - A Question Answering System in the Web using the Web.

Chicago Style (17th ed.) Citation

Costa, Luís. Esfinge - A Question Answering System in the Web Using the Web. 2009.

MLA (8th ed.) Citation

Costa, Luís. Esfinge - A Question Answering System in the Web Using the Web. 2009.

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