Comportamenti, stili di servizio, strategie di comunicazione.

The paper represents the third stage of the 'Ways of sustainability", after reflections on buildings, specialized collections, training and educational initiatives. In this series of papers different themes are faced, all referable to libraries sustainability. This paper analyses the strategic role of communication, reporting Italian examples relating to public and academic libraries, guiding principles and actions that promote a more sustainable behavior of librarians and users in the library and in everyday life and ensure that libraries become an example for citizens. [ABSTRACT FROM AUTHOR]