Helander, M. (2006). A guide to human factors and ergonomics (Second edition.). CRC Press/Taylor & Francis Group.
Lua i Stíl Chicago (17ú heag.)Helander, Martin. A Guide to Human Factors and Ergonomics. Second edition. Boca Raton, FL: CRC Press/Taylor & Francis Group, 2006.
Lua MLA (8ú heag.)Helander, Martin. A Guide to Human Factors and Ergonomics. Second edition. CRC Press/Taylor & Francis Group, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.