Internal and external integration in hotel industries is essential to improve Green Supply Chain Management (GSCM) to maintain hotel performance and sustainability. This research is to examine the impact of internal and external integration on GSCM and hotel performance. It is quantitative research with judgmental sampling. Questionnaires were distributed to 72 hotel employees from 62 hotels of three-star hotels and above, who understand GSCM and hotel performance in East Java. But 66 questionnaires were returned, and only 62 questionnaires were valid for data analysis. Structural Equation Modelling (SEM) is used to analyze with the help of Java Web Start software. The results show that all six hypotheses are supported, internal integration with Use technology to significantly determine plans and coordination capable of external integration and GSCM. External integration with Sharing knowledge with partners and Collaborating in solving problems can improve GSCM significantly. Supply chain integration, which consists of internal integration and external integration, impacts hotel performance by reducing hotel waste and Efficient use of resources. GSCM in implementing Eco green, green procurement and product life cycle have a significant impact on improving hotel performance.

Many people are aware of taking care of the global environment, so they demand environmentally friendly business activities. The government also has responded to the commotion by requiring companies to produce friendly and safe products or services to their customers. Hotel industries react to it by implementing the concept of green hotels. The purpose of this study is to examine whether the Internet of Things, strategic green purchasing and green operation have impacted green employee behavior in star-hotels in East Java. Eighty-two (82) questionnaires were distributed, but only 62 questionnaires were valid, with a response rate of 75.60 %. SEM-PLS (Structural Equation Modelling Partial Least Square) was used to analyze the data. The results show that the Internet of Things (IoT) has a significant impact on green hotel operation, with the T-statistic value of 0.378. green purchasing has a significant impact on green hotel operation, with the T-statistic value of 0.545, and green employee behavior, with the T-statistic value of 0.346. The Internet of things (IoT) has no significant impact on green employee behavior directly but through green hotel operation. The use of energy efficiency and the existence of good waste management as indicators of green hotel operation has an impact on green employee behavior of 0.346.

The company builds communication and collaboration with suppliers and customers to increase competitiveness in the supply chain flow. The organization's ability to involve suppliers and customers in business activities to achieve efficiency and effectiveness is one of the objectives of supply chain practice. The distribution of questionnaires directly to hotel practitioners was 25 respondents, and 65 respondents obtained the distribution of google form links. The results showed that supply chain practices with supplier relationship management and quality information sharing activities could increase internal and upstream integration and not directly impact downstream integration. Internal integration with data integration activities accurately and coordination between functions on an ongoing basis can affect upstream and downstream integration and green hotel performance. Upstream integration and downstream integration with joint decision activities and planning synchronization with external parties can directly impact green hotel performance. They were increasing the market share and image of the hotel with the implementation of caring for the environment. This research contributes to hotel practitioners adopting practical supply chains in building internal and external integration to increase competitiveness and theoretical contribution to developing supply chain theory and green performance.