BARNES, R. M., & BARNES, R. M. (1980). Motion And Time Study Design And Measurement Of Work. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)BARNES, Ralph M., agus Ralph M. BARNES. Motion And Time Study Design And Measurement Of Work. John Wiley & Sons, 1980.
Lua MLA (8ú heag.)BARNES, Ralph M., agus Ralph M. BARNES. Motion And Time Study Design And Measurement Of Work. John Wiley & Sons, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.