This text discusses the benefits of using textbooks and books in research. It highlights key features that are valuable for researchers, such as providing an introduction, background, and basic information on a topic, and documenting sources used in developing concepts and arguments. The text also mentions specific recommended books for academic research, including "Research Design: Qualitative, Quantitative, and Mixed Methods Approaches" and "The Craft of Research." It emphasizes the importance of books as sources for in-depth coverage and overviews of topics, and also acknowledges the availability of online resources. Additionally, the text notes that books may not always be considered academic sources, depending on their purpose and intended audience.