The above table shows that a researcher has to review the various kinds of literature relating to the selected field of study. How can be identify the related materials? This research procedure involves a series of steps. The exact sequence will vary depending upon the subject and the knowledge of the researcher. A general approach is suggested below:

1.Request learned professors librarians or others familiar with the field to suggest relevant references.

2.Find out whether any bibliography already prepared on the subject is available in the library. See the bibliographic index if any maintained in the library.

3. Consult bibliographies in the these on the topic and related topics.

4.See the card catalogues of the library. (I)Author catalogue cards if the authors of books are known: (II) subject catalogue cards to locate the titles and other details of the books on the subject.

5.Examine periodicals monographs reports and conference proceedings and other materials including microfilms available in the library.

6.Consult reference cited in the books and articles already located. Each book or article will be a means for locating additional references.

7.Consult the abstract journal on the subject or abstracts section in the journals relating to the subject.

8. See the book review pages in the daily newspapers and in the journals.