APA (7th ed.) Citation

Lopes, C., Cortez, P., & Sousa, P. (2010). Towards symbiotic spam e-mail filtering.

Chicago Style (17th ed.) Citation

Lopes, Clotilde, Paulo Cortez, and Pedro Sousa. Towards Symbiotic Spam E-mail Filtering. 2010.

MLA (8th ed.) Citation

Lopes, Clotilde, et al. Towards Symbiotic Spam E-mail Filtering. 2010.