APA (7th ed.) Citation

Chaves, M., Martins, B., & Silva, M. J. (2009). GKB - Geographic Knowledge Base.

Chicago Style (17th ed.) Citation

Chaves, Marcirio, Bruno Martins, and Mário J. Silva. GKB - Geographic Knowledge Base. 2009.

MLA (8th ed.) Citation

Chaves, Marcirio, et al. GKB - Geographic Knowledge Base. 2009.