Cita APA (7a ed.)

Roberts L. Lorena. (2010). Happy Street 1: Teacher's Book. New York, Oxford University Press, 2010.

Cita Chicago Style (17a ed.)

Roberts L. Lorena. Happy Street 1: Teacher's Book. New York, Oxford University Press, 2010, 2010.

Cita MLA (9a ed.)

Roberts L. Lorena. Happy Street 1: Teacher's Book. New York, Oxford University Press, 2010, 2010.