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دليل المستخدم
Huwaishel، A. A. M. Z.، و Keller، A. (1993). An Assessment of the Present Status of Safety Management Practices and Performance is Obtained Using A Structured Questionnaire, Statistical Analysis Identifies Critical Areas, Problems and Practices Requiring Improvements (رسالة دكتوراه غير منشورة). University of Bradford، برادفورد. مسترجع من http://search.mandumah.com/Record/600618
Huwaishel، Abd Allah M. Z.، و Alf Keller. "An Assessment of the Present Status of Safety Management Practices and Performance Is Obtained Using A Structured Questionnaire, Statistical Analysis Identifies Critical Areas, Problems and Practices Requiring Improvements" رسالة دكتوراه. University of Bradford، برادفورد، 1993. مسترجع من http://search.mandumah.com/Record/600618