APA (7th ed.) Citation

Valmaggia, L. R., Day, F. L., Jones, C., Bissoli, S., Pugh, C., Hall, D., . . . McGuire, P. K. (2014). Cannabis use and transition to psychosis in people at ultra-high risk. Psychological Medicine, 44(12), 2503. https://doi.org/10.1017/S0033291714000117

Chicago Style (17th ed.) Citation

Valmaggia, L. R., et al. "Cannabis Use and Transition to Psychosis in People at Ultra-high Risk." Psychological Medicine 44, no. 12 (2014): 2503. https://doi.org/10.1017/S0033291714000117.

MLA (9th ed.) Citation

Valmaggia, L. R., et al. "Cannabis Use and Transition to Psychosis in People at Ultra-high Risk." Psychological Medicine, vol. 44, no. 12, 2014, p. 2503, https://doi.org/10.1017/S0033291714000117.