Cita APA

Roberts, L., & Lorena Roberts. (2000). Happy House: Teacher's Book. Oxford: Oxford University Press.

Chicago Style Citation

Roberts, Lorena, i Lorena Roberts. Happy House: Teacher's Book. Oxford: Oxford University Press, 2000.

Cita MLA

Roberts, Lorena, i Lorena Roberts. Happy House: Teacher's Book. Oxford: Oxford University Press, 2000.

Atenció: Aquestes cites poden no estar 100% correctes.