Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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