Cita APA (7a ed.)

Ashworth, J., & Clark, J. (1997). Top class: 1 primary. Oxford University.

Cita Chicago Style (17a ed.)

Ashworth, Julie, y John Clark. Top Class: 1 Primary. Oxford [etc.]: Oxford University, 1997.

Cita MLA (9a ed.)

Ashworth, Julie, y John Clark. Top Class: 1 Primary. Oxford University, 1997.