Mathis, T. L., & Galloway, S. M. (2013). STEPS to safety culture excellence. J. Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Mathis, Terry L., agus Shawn M. Galloway. STEPS to Safety Culture Excellence. Hoboken, N.J.: J. Wiley & Sons, 2013.
Lua MLA (9ú heag.)Mathis, Terry L., agus Shawn M. Galloway. STEPS to Safety Culture Excellence. J. Wiley & Sons, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.