External Secondary Data:
The second form of secondary data is external sources which are generally published and are available in different form and form different sources. Although external secondary data may be obtained from different sources some of the source are given here.
a. Libraries: Researcher first attend libraries to find out relevant data pertaining to researcher. They provide many source where suitable data may be obtained public libraries and college and university libraries contain a large amount of business information which provides sources o other data. Management books theses management journals and others publications can be consulted in these libraries. Management institutes research institutes banks insurance companies public utility companies and manufacturing units have maintained adequate libraries.
b. Literature: A great amount of secondary data is available from literature particularly literature on marketing subjects. With the development of marketing researches in different countries new and interesting facts are coming into the picture which are available in various publications. Consultations of this literature may provide proper guidance pertaining to publications which can be used from time to time.
c. Periodicals: Business periodicals published fortnightly monthly quarterly semi annually and annually are often consulted by the marketing executives and researcher to plan and design their marketing research. Also to use the available data for research purposes and to verify the conclusions derived form the marketing research, especially of field research periodical economic abstracts on economics, finance trade transport industry labor and management are being prepared by the government as well as by the non government agencies. Journals of the marketing association management association research agencies advertising agencies and other related periodicals are becoming very common in India and abroad.