APA

Prieto M., Macdonald J. & Robbins L. (2006). English Zone. Uk: Mc Graw Hill.

Chicago

Prieto Margarita, Macdonald Judy and Robbins Lauren. 2006. English Zone. Uk: Mc Graw Hill.

Harvard

Prieto M., Macdonald J. and Robbins L. (2006). English Zone. Uk: Mc Graw Hill.

MLA

Prieto Margarita, Macdonald Judy and Robbins Lauren. English Zone. Uk: Mc Graw Hill. 2006.