9789702608325 | Pearson Educacion De Mexico, January 1, 2008, cover price $17.95 | About this edition: This book contains varied supports for the student for better understanding, like self-evaluations at the end of each section, a guide to succeed in oral presentations, and it provides a simple formula to equalize theory and practice.

9788478274925 | Celesa, May 30, 2007, cover price $30.95

9789702611059 | Pearson Educacion De Mexico, January 1, 2007, cover price $21.45 | About this edition: This is a work that claims that students establish a significant contact with language, by understanding and practicing in their element in a manner that internalizes its correct use, with each exercise it motivates reflection and self-criticizing to strengthen in students human values related to socializing and tolerance.