General Knowledge · Library Science & Information Sources

Assertion (A): Giljarevskij's classification of information sources into only Primary and Secondary categories — without a tertiary level — necessitates placing library catalogues under secondary sources despite their conventional classification as tertiary tools. Reason (R): Since Giljarevskij's scheme does not recognise a tertiary category, all sources that guide users to other sources — including library catalogues — must be accommodated within the secondary category, even though their functional role as meta-informational tools would logically place them at a tertiary level in other classification systems.