APA

Lowes R., . (2006). Attitude: Workbook 1. México: Macmillan.

Chicago

Lowes Ricky, . 2006. Attitude: Workbook 1. México: Macmillan.

Harvard

Lowes R., . (2006). Attitude: Workbook 1. México: Macmillan.

MLA

Lowes Ricky, . Attitude: Workbook 1. México: Macmillan. 2006.