NIEBEL, B. W. Methods, standars and work design#Benjamin W. Niebel, Andris Freivalds. McGraw-Hill.
Čikaški stil citiranja (17. izdanje)NIEBEL, Benjamin W. Methods, Standars and Work Design#Benjamin W. Niebel, Andris Freivalds. McGraw-Hill.
MLA način citiranja (8. izdanje)NIEBEL, Benjamin W. Methods, Standars and Work Design#Benjamin W. Niebel, Andris Freivalds. McGraw-Hill.
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