American engineering council. (1922). The twelve-hour shift in industry. E. P. Dutton & Company.
Lua i Stíl Chicago (17ú heag.)American engineering council. The Twelve-hour Shift in Industry. New York: E. P. Dutton & Company, 1922.
Lua MLA (9ú heag.)American engineering council. The Twelve-hour Shift in Industry. E. P. Dutton & Company, 1922.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.