1. Wiegmann DA, Zhang H, von Thaden T. Defining and assessing safety culture in high reliability systems: an annotated bibliography. Savoy, IL, USA: Aviation Research Lab; 2001.
2. Nunnally JC, Bernstein IH. Psychometric theory. 3rd ed. New York, NY, USA: McGraw-Hill; 1994.
3. Hair JF, Anderson RE, Tatham RL, Black WC. Multivariate data analysis with reading. 5th ed. Englewood Cliffs, NJ, USA: Prentice Hall; 1998.