Robertson, L. N. (1985). Purchasing for food service: Self-instruction. Iowa State University Press.
Čikaški stil citiranja (17. izdanje)Robertson, Lynne Nannen. Purchasing for Food Service: Self-instruction. Ames, Iowa: Iowa State University Press, 1985.
MLA način citiranja (8. izdanje)Robertson, Lynne Nannen. Purchasing for Food Service: Self-instruction. Iowa State University Press, 1985.
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