8Ashforth, B. E. , & Humphrey, R. H. (1993). Emotional labor in service roles: The influence of identity. Academy of Management Review, 18 (1), 88-115.
9Brotheridge, C. M., & Grandey, A. (2002). Emotional labor and burnout: comparing two perspectives of "people work". Journal of Vocational Behavior, 60, 17-39.
10Cheng, Y., Luh, W. M., & Guo, Y. L. (2003). Reliability and validity of the Chinese version of the Job Content Questionnaire in Taiwan Residents workers. International Journal of Behavioral Medicine. 10 (1). 15-30.