MLA

Nagai, et al. Cefr-informed Learning, Teaching and Assessment: A Practical Guide. Springer Singapore, 2020.

APA

Nagai, N., Birch, G. C, Bower, J. V, & Schmidt, M. Gabriela. (2020). CEFR-informed Learning, Teaching and Assessment: A Practical Guide. Springer Singapore.

Chicago

Nagai, Gregory C Birch, Jack V Bower, and Maria Gabriela Schmidt. Cefr-Informed Learning, Teaching and Assessment: A Practical Guide. : Springer Singapore, 2020.