Cita APA (7a ed.)

O'Neill, R., & Burgess, S. (1997). English works 2: Teacher's book.

Cita Chicago Style (17a ed.)

O'Neill, Robert, y Sally Burgess. English Works 2: Teacher's Book. Edinburgh, 1997.

Cita MLA (9a ed.)

O'Neill, Robert, y Sally Burgess. English Works 2: Teacher's Book. 1997.