See:
Oberg, K. (1960). Culture shock: Adjustment to new cultural environments. Practical Anthropology, 7(4), 177-182.
Ward, C., Bochner, S., & Furnham, A. (2001). The Psychology of Culture Shock. Routledge.
Pedersen, P. (1995). The Five Stages of Culture Shock: Critical Incidents Around the World. Greenwood Press.