Information Sources, Resources and Services:
The term 'Information sources' has two connotations. One is that of the stores or locations in which information kept Therefore, a sources information may be an object, a place, an organisation or a particular person, for example, an encyclopaedia, a database, a warehouse, a library, a telephone number, or an expert. Sources may be personal or impersonal, public or private, passive or interactive, stored locally or remotely, to which immediate or delayed access may be gable# In the second connotation, information sources are virtually indistinguishable form of information channels b cause the latter may be written such as a book, or words in some other printed or processed format, or verbal sounds, ±Ch as a telephone, or data line. In a discussion on information phenomena, the term channel is not reserved for the communication channel as in the telecommunications sense. In fact, in the telecommunications environment, identity of source and channels likely to be less obvious. In accessing to a telecommunications network, forget the ultimate address of the information is usually unknown and irrelevant to the inform, as is the .particular path through which information is delivered.