Cita APA (7a ed.)

Maidment, S., & Roberts, L. (2003). Happy Street: Class book 1 (7a. ed.). University Press.

Cita Chicago Style (17a ed.)

Maidment, Stella, y Lorena Roberts. Happy Street: Class Book 1. 7a. ed. Oxford: University Press, 2003.

Cita MLA (9a ed.)

Maidment, Stella, y Lorena Roberts. Happy Street: Class Book 1. 7a. ed. University Press, 2003.