Frankel, L. K., & Fleisher, A. (1920). The human factor in industry. Macmillan Co..
Lua i Stíl Chicago (17ú heag.)Frankel, Lee K., agus Alexander Fleisher. The Human Factor in Industry. New York: Macmillan Co., 1920.
Lua MLA (8ú heag.)Frankel, Lee K., agus Alexander Fleisher. The Human Factor in Industry. Macmillan Co., 1920.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.