The cookbook provides a detailed guide on generating source-backed responses using Ragie for document retrieval and OpenAI's GPT-4o for response generation, emphasizing the importance of citing sources in applications requiring verifiable information. To set up, users need to import necessary libraries and initialize Ragie and OpenAI with API keys, followed by defining a response schema using the Zod library to format responses with a message and document IDs for citations. It explains the process of retrieving relevant document chunks from Ragie, creating a system message to incorporate these chunks, and generating a response with OpenAI while ensuring the output adheres to the defined schema. The guide further details how to format the final output with hyperlinked citations to the original document sources, enhancing the response's credibility. An example usage demonstrates how to apply this setup, illustrating the generation of a response that cites Company X's sustainability goals from a specific document, thereby showcasing the method's practical application and effectiveness in integrating source-backed responses into applications.