APA (7th ed.) Citation

Bush, A., Piacentini, G., Santamaria, F., Ullmann, N., & Cutrera, R. (2019). Difficult and Severe Asthma in Children. Frontiers Media SA.

Chicago Style (17th ed.) Citation

Bush, Andrew, Giorgio Piacentini, Francesca Santamaria, Nicola Ullmann, and Renato Cutrera. Difficult and Severe Asthma in Children. Frontiers Media SA, 2019.

MLA (9th ed.) Citation

Bush, Andrew, et al. Difficult and Severe Asthma in Children. Frontiers Media SA, 2019.