Mention the important sources

of collecting secondary data.

Main sources of the secondary data can be classified into two groups :

1. Published sources :

(а) Government Publications

(b) Semi-government Publications

(c) International Publications

(d) Private Publications

(e) Research Publications
2. Unpublished sources : Secondary Data can be obtained from unpublished sources, because all statistical material is not always published. Studies made by research institutions, scholars etc. can be important sources of secondary data.