They are;
a)Government Publications : State and central government publish reports various committes and commisions and official publications like gazzetes, vital statistics, sensex, etc.
b)International Publications : Various foreign government and international agencies like U.N, UNISFF, World Bank, IMF regularly published reports of data collected by them on various aspects.
c)Semi-Official Publications : Various local bodies such as municipal corporations, district boarels, etc. Publish periodicals providing informations about vital factors like healt, birth, death, etc.
d)Private Publications : The private sources of secondary data are;
-Reports prepared by research scholars, universities, etc.
-Publication of NCERT, ISI, CSIR, etc.
-Information published in newspapers, books, magazines, etc.
