APA (7th ed.) Citation

Serrano, J. M., Peça, J. M., Pinheiro, A. C., Carvalho, M. J., & Marques da Silva, J. R. (2009). Tractor energy requirements in disc harrow systems.

Chicago Style (17th ed.) Citation

Serrano, João M., José M. Peça, Anacleto C. Pinheiro, Mário J. Carvalho, and José R. Marques da Silva. Tractor Energy Requirements in Disc Harrow Systems. 2009.

MLA (8th ed.) Citation

Serrano, João M., et al. Tractor Energy Requirements in Disc Harrow Systems. 2009.