RICHARDS, R. (1991). An Early Start To Technology From Science Roy Richars. Simon and Schuster.
Čikaški stil citiranja (17. izdanje)RICHARDS, Roy. An Early Start To Technology From Science Roy Richars. Simon and Schuster, 1991.
MLA način citiranja (8. izdanje)RICHARDS, Roy. An Early Start To Technology From Science Roy Richars. Simon and Schuster, 1991.
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