TY  - BOOK
AU  - Mario Herrera Salazar y Diane Pinkley 
TI  - Backpack 1. Teacher's edition
SN  - 131826867
U1  - 428 H565 Ej. 1 
PY  - 0000///Longman
PB  - 2005
KW  - English language Study and teaching (Elementary) Foreign speakers
ER  -