The provided content consists of multiple research articles and online resources related to the hospitality industry, specifically focusing on environmentally-related research, business-level strategy, organizational development strategies, customer satisfaction, and external environmental factors. The sources explore topics such as hotel performance, work-family balance, entrepreneurial ventures, and market orientation, with a focus on the impact of external environments on these areas. Online resources include indexes, economic systems, industry reports, and case studies. This diverse range of research and resources provides valuable insights for understanding the complexities of the hospitality industry and its relationship to the external environment.