APA (7th ed.) Citation

Silva, A., Oliveira, A., & Afonso, C. (1999). Testing of Ventilation Assistance Units.

Chicago Style (17th ed.) Citation

Silva, A., A. Oliveira, and C.F.A Afonso. Testing of Ventilation Assistance Units. 1999.

MLA (8th ed.) Citation

Silva, A., et al. Testing of Ventilation Assistance Units. 1999.