Crutchfield, N., & Roughton, J. (2014). Safety culture: An innovative leadership approach. Butterworth-Heinemann.
Lua i Stíl Chicago (17ú heag.)Crutchfield, Nathan, agus James Roughton. Safety Culture: An Innovative Leadership Approach. Oxford, England ; Waltham, Mass.: Butterworth-Heinemann, 2014.
Lua MLA (9ú heag.)Crutchfield, Nathan, agus James Roughton. Safety Culture: An Innovative Leadership Approach. Butterworth-Heinemann, 2014.
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