APA (7th ed.) Citation

Barrera Wey, P., & Duque Romero, M. I. (2009). New generation 9: For teenagers. Norma.

Chicago Style (17th ed.) Citation

Barrera Wey, Pilar, and María Isabel Duque Romero. New Generation 9: For Teenagers. Bogotá: Norma, 2009.

MLA (9th ed.) Citation

Barrera Wey, Pilar, and María Isabel Duque Romero. New Generation 9: For Teenagers. Norma, 2009.