Perlego works with educators and publishers to create a digital library of more than a million books available anywhere in the world. Library Features: - If you learn better by listening, use ‘Read Aloud’ and set a speed that suits you, up to a chipmunk-friendly 2x. - Search for keywords in the book and cut a chunk off your reading time - Keep all your highlights, notes, quotes and citations in your Notebook, and return to them any time – even without an active membership. - Use BeeLine Reader’s color-changing font to pull your eyes through text, helping you read at twice your average speed. Perlego study guides are created by Master's and PhD experts. Each one is designed to help you get to grips with key academic concepts and subjects — clear, simple, and effortless to understand, so you can start your research.