APA

Sayer M., Dellar H. & Walkley A. (2020). Teacher's book. : .

Chicago

Sayer M, Dellar H and Walkley A. 2020. Teacher's book. : .

Harvard

Sayer M., Dellar H. and Walkley A. (2020). Teacher's book. : .

MLA

Sayer M, Dellar H and Walkley A. Teacher's book. : . 2020.