> **Copied from upstream:** [dair-ai/Prompt-Engineering-Guide#224](https://github.com/dair-ai/Prompt-Engineering-Guide/issues/224) > **Original author:** @jannikjw > **Originally created:** 2023-07-12 --- > You can find a [simple example of how to use retrievers and LLMs for question answering with sources(opens in a new tab)](https://python.langchain.com/en/latest/modules/chains/index_examples/vector_db_qa_with_sources.html) from the LangChain documentation. The link in the text above is out-of-date
The link in the text above is out-of-date