Mario Herrera

Backpack Student Book & CD-ROM, Level 1: Student Book and CD-Rom, Level 1 (Backpack (Pearson))

By Mario Herrera, Diane Pinkley

Backpack Student Book & CD-ROM, Level 5: Student Book and CD-Rom Level 5

By Mario Herrera, Diane Pinkley

Backpack 3 with CD-ROM

By Mario Herrera, Diane Pinkley

Backpack 4 with CD-ROM

By Mario Herrera, Diane Pinkley

Backpack 6 with CD-ROM

By Mario Herrera, Diane Pinkley

Backpack 3 Teacher's Edition

By Mario Herrera, Diane Pinkley

Big English Plus 6 Teacher's Book

By Mario Herrera, Christopher Cruz, Christopher Sol Cruz