The Community Movement (Movimento Comunità) was Adriano Olivetti's broader social philosophy: focused on worker participation, cooperative economics, and community-based organization. there is not so much in English, all my knowledge comes from Italian sources. The Italian wikipedia page in the section Bibliografia lists some books in Italian, maybe you'll be able to find them, at least now we have the advantage to be able to translate on the fly. Anyway here http://momoneco.kotka.fi/ivrea_nayttely_4_uk.html there is something about the urban planning.