APA

Sayer M., . (2014). Life: beginner: teacher´s book. Hampshire: Cengage Learning; National Geographic Learning.

Chicago

Sayer Mike, . 2014. Life: beginner: teacher´s book. Hampshire: Cengage Learning; National Geographic Learning.

Harvard

Sayer M., . (2014). Life: beginner: teacher´s book. Hampshire: Cengage Learning; National Geographic Learning.

MLA

Sayer Mike, . Life: beginner: teacher´s book. Hampshire: Cengage Learning; National Geographic Learning. 2014.