Integrated Thematic Book for Class IV Curriculum 2013. This application was created to make it easier for students to study anywhere and anytime. The 2013 curriculum Integrated Thematic Book is a free book whose copyright is owned by the Ministry of Education and Culture which can be distributed to the public for free. The material in the application is sourced from https://buku.kemdikbud.go.id. This application is not an application developed by the Ministry of Education and Culture. The application helps provide learning resources but does not represent the Ministry of Education and Culture. The features available in this application are: 1. Links between chapters and sub-chapters 2. Responsive display that can be enlarged. 3. Page Search. 4. Minimalist landscape display. 5. Zoom In and Zoom Out. The material discussed is based on Elementary School Class 4 Theme 2 2013 Curriculum material sourced from kemdikbud.go.id. This application helps provide learning resources but does not represent the Ministry of Education and Culture. Subtheme 1 Energy Sources Subtheme 2 Benefits of Energy Subtheme 3 Alternative Energy