APA

O'Connell S., Foley M. & Whitehead R. (2001). Focus on Advanced English C.A. E. : Longman.

Chicago

O'Connell S, Foley M and Whitehead R. 2001. Focus on Advanced English C.A. E. : Longman.

Harvard

O'Connell S., Foley M. and Whitehead R. (2001). Focus on Advanced English C.A. E. : Longman.

MLA

O'Connell S, Foley M and Whitehead R. Focus on Advanced English C.A. E. : Longman. 2001.