APA (7th ed.) Citation

Whedon, J., Downey Tr, R., Evans, C., & Johanson, S. Avengers: Age of ultron.

Chicago Style (17th ed.) Citation

Whedon, Joss, Robert Downey Tr, Chris Evans, and Scarlett Johanson. Avengers: Age of Ultron.

MLA (9th ed.) Citation

Whedon, Joss, et al. Avengers: Age of Ultron.