APA (7th ed.) Citation

Maidment St. Stella & Roberts L. Lorena. (2009). Happy Street 2: Class Book. New York, Oxford University Press, 2009.

Chicago Style (17th ed.) Citation

Maidment St. Stella and Roberts L. Lorena. Happy Street 2: Class Book. New York, Oxford University Press, 2009, 2009.

MLA (9th ed.) Citation

Maidment St. Stella and Roberts L. Lorena. Happy Street 2: Class Book. New York, Oxford University Press, 2009, 2009.