Do "Oxford", "Cambridge", or "Longman" ring a bell in you when it comes to language learning? Surely your mind will automatically link to the language books for English language learners. Since millions of people worldwide learn English for their work or life purposes, kind hearts have made it more accessible for the learners to find the electronic version of those books through courtesy digital library such as https://archive.org/.
Some of these books can also be found in this blog post, too. Just check out the following list and download the books for your learning.