Backpack (4) 2/e Workbook with Audio CD/1片
作者：Mario Herrera, Diane Pinkley
ISBN：9780132451673
Backpack (4) 2/e Teacher's Edition
ISBN：9780132451468
Backpack (4) 2/e Student Book with CD/1片
ISBN：9780132450843
Backpack (4) 2/e DVD/1片
ISBN：9780132451499
Backpack (4) 2/e Class Audio CDs/2片
ISBN：9780132451482
Backpack (3~4) 2/e Picture Cards with Teacher's Activity Guide
ISBN：9780132451321
Backpack (3) 2/e Workbook with Audio CD/1片
ISBN：9780132451048
Backpack (3) 2/e Teacher's Edition
ISBN：9780132451055
Backpack (3) 2/e Student Book with CD/1片
ISBN：9780132450836
Backpack (3) 2/e DVD/1片
ISBN：9780132451031
Backpack (3) 2/e Class Audio CDs/2片
ISBN：9780132451420
Backpack (2) 2/e Workbook with Audio CD/1片
ISBN：9780132451307
Backpack (2) 2/e Teacher's Edition
ISBN：9780132451314
Backpack (2) 2/e Student Book with CD/1片
ISBN：9780132450829
Backpack (2) 2/e DVD/1片
ISBN：9780132451284
