Cita APA (7a ed.)

Maidment, S., & Roberts, L. (2004). Happy Street: Class book 2 (5a. ed.). Oxford University.

Cita Chicago Style (17a ed.)

Maidment, Stella, y Lorena Roberts. Happy Street: Class Book 2. 5a. ed. Oxford: Oxford University, 2004.

Cita MLA (9a ed.)

Maidment, Stella, y Lorena Roberts. Happy Street: Class Book 2. 5a. ed. Oxford University, 2004.