एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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