APA استشهاد

Andris Freivalds. (2008). Niebel's methods, standards & work design. McGraw-Hill.

استشهاد بنمط شيكاغو

Andris Freivalds. Niebel's Methods, Standards & Work Design. McGraw-Hill, 2008.

MLA استشهاد

Andris Freivalds. Niebel's Methods, Standards & Work Design. McGraw-Hill, 2008.