ผลต่างระหว่างรุ่นของ "ชั่วโมงแรงงาน"

* [http://www.eldritchpress.org/fwt/taylor.html ''The Principles of Scientific Management''] F.W.Taylor, 1911, online

* [http://onlinebooks.library.upenn.edu/webbin/gutbook/lookup?num=6464 ''Shop Management''], F.W.Taylor, 1911, online

* [http://www.fordham.edu/halsall/mod/1911taylor.html A Selection from Frederick Taylor's Essays], online

* Man-year defined as 2000 hours: http://www.onr.navy.mil/02/matoc/05_09/solicitations/docs/05-0002-02.pdf (Solicitation Number 05-0002-02: Support Services for the Office of Naval Research for the Legislative Affairs Office (United States Navy Office of Naval Research: Arlington, Virginia, USA, 2004)

* Man-year defined as 2087 man-hours: [http://www.ifptelocal32.com/CA/Report%205.htm Report 5, International Federation Of Professional And Technical Engineers Local 32: San Diego, California, 2000](counting 311 "Non-available/Nonproductive" man-hours)