Cita APA

Johannsen, K. L., & Chase, R. (2010). World english 2: Real people, real places, real language. Berlin, Germany: National Geographic Learnign.

Citación estilo Chicago

Johannsen, Kristin L., y Rebeca Chase. World English 2: Real People, Real Places, Real Language. Berlin, Germany: National Geographic Learnign, 2010.

Cita MLA

Johannsen, Kristin L., y Rebeca Chase. World English 2: Real People, Real Places, Real Language. Berlin, Germany: National Geographic Learnign, 2010.