"Online Arbitrage 2020 Version: Sourcing Secrets" by Chris Green is a manual on internet sales that focuses on online arbitrage. The book is intended for young adults and adults interested in business, economics, and industry. It provides valuable insights and strategies for sourcing products to sell online, making it a valuable resource for those looking to start or enhance their online sales business. With its paperback format and English language, this book is a practical guide for anyone looking to learn more about online arbitrage.