Cita APA

Hadfield, J., & Hadfield, C. (1999). Simple speaking activities. Oxford: Oxford University Press.

Chicago Style Citation

Hadfield, Jill, i Charles Hadfield. Simple Speaking Activities. Oxford: Oxford University Press, 1999.

Cita MLA

Hadfield, Jill, i Charles Hadfield. Simple Speaking Activities. Oxford: Oxford University Press, 1999.