APA (7th ed.) Citation

Portela, P. M. D., Sepúlveda, J., & Esteves, J. S. (2008). Alternating current and direct current generator.

Chicago Style (17th ed.) Citation

Portela, Pedro Miguel Dourado, João Sepúlveda, and João Sena Esteves. Alternating Current and Direct Current Generator. 2008.

MLA (8th ed.) Citation

Portela, Pedro Miguel Dourado, et al. Alternating Current and Direct Current Generator. 2008.