Barr, D. R. (1972). Trends in book production and prices: A paper prepared for the National Libraries ADP Feasibility Study. National Central Library.
Čikaški stil citiranja (17. izdanje)Barr, Diana R. Trends in Book Production and Prices: A Paper Prepared for the National Libraries ADP Feasibility Study. London: National Central Library, 1972.
MLA način citiranja (8. izdanje)Barr, Diana R. Trends in Book Production and Prices: A Paper Prepared for the National Libraries ADP Feasibility Study. National Central Library, 1972.
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