Freivalds, A. (2014). Niebel's methods, standards, and work design (13. edition.). McGraw-Hill Higher Education.
Chicago Style (17. basım) AtıfFreivalds, Andris. Niebel's Methods, Standards, and Work Design. 13. edition. Boston: McGraw-Hill Higher Education, 2014.
MLA (9th ed.) AtıfFreivalds, Andris. Niebel's Methods, Standards, and Work Design. 13. edition. McGraw-Hill Higher Education, 2014.
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