@book{ title = {Teacher's guide and tests two}, author = {Spiazzi, Marina}, editor = {Layton, Margaret}, editor = {Tavella, Marina}, editor = {998016576708896 - Performer B1 with PET tutor - 2.2 - }, editor = {Contenuti online, riservati agli insegnanti, al sito online.zanichelli.it/performerB1 }, year = {2015}, address = {Bologna }, publisher = {Zanichelli}, }