The paper examines Alberto Salarelli's book Introduzione alia scienza dell' informazione ("Introduction to Information Science", Milano, Editrice Bibliografica, 2012) with particular attention to the location of this disciplinary field within the wider context of bibliography and library science. The first part briefly discusses how the author presents the discipline's key concepts (data, information, document), and examines the theories and meta-theories that identify its context, taking into consideration the studies of Luciano Floridi, Maurizio Ferraris, Michael Buckland, Wolfgang Hofkirchner. The second part deals with some theoretical and ontological issues concerning the relationships between objects in the physical world, documents, and their bibliographic representation, finally proposing a new location of Information Science into the wider frame of bibliography in its historical and cultural dimension. [ABSTRACT FROM AUTHOR]