From the outset Library and Information Science as a field of discipline began as part of the social sciences (or applied social sciences) in the 1930s. However, due to the practicality and technology emphasized by functionalists, the social science characteristics deteriorated and the science and technological aspect became more accentuated. Ultimately, Library and Information Science was not able to identify its main research subject of libraries and associated apparatuses as a form of social knowledge system, and could not help but neglect to induct and apply theory and philosophy from the social sciences. In the present study, after an examination of social epistemology and sociology of knowledge, which are important epistemological foundations necessary for the strengthening of social scientific aspect of Library and Information Science, a new research parameter called sociology of library was presenteL The sociology of library will be a scheme for an epistemological turnover on the discipline of Library and Information Science.