Cita APA

Douglas Nancy. (2013). World class 1: Expanding english fluency. Estados Unidos de América: Cengage Learning ; National Geographic Learning.

Citación estilo Chicago

Douglas Nancy. World Class 1: Expanding English Fluency. Estados Unidos de América: Cengage Learning ; National Geographic Learning, 2013.

Cita MLA

Douglas Nancy. World Class 1: Expanding English Fluency. Estados Unidos de América: Cengage Learning ; National Geographic Learning, 2013.