The main missions of libraries are to gather and disseminate information and to assist users in solving information problems. To investigate the methods of seeking information used by librarians in dealing with their daily tasks in workplace, this study uses in-depth interviews to investigate the information needs and information-seeking behavior of 16 academic librarians in universities. The results show that the categories of the librarians' information needs are highly associated with the requirements of their tasks. University librarians have no difficulty in finding information because of their Library and Information Science majors. Although librarians use numerous information sources to obtain information, they particularly rely on interpersonal network and the Internet. The type of tasks and the extent of emergency of an information need also affect information sources used by librarians.