Style de citation APA

 Stephenson, H. (2020). Life A2- B1: Student's book.  National geographic learning.

Style de citation Chicago

 Stephenson, Helen. Life A2- B1: Student's Book.  National geographic learning, 2020.

Style de citation MLA

 Stephenson, Helen. Life A2- B1: Student's Book.  National geographic learning, 2020.

Attention : ces citations peuvent ne pas être correctes à 100%.