MLA

Abreu, et al. Advances In Tourism, Technology and Systems. Springer Singapore, 2021.

APA

Abreu, A., Garcia Ojeda, J. Carlos, González, E. Alén, & Liberato, D. (2021). Advances in Tourism, Technology and Systems. Springer Singapore.

Chicago

Abreu, Juan Carlos Garcia Ojeda, Elisa Alén González, and Dália Liberato. Advances In Tourism, Technology and Systems. : Springer Singapore, 2021.