APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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