Oxford Scholarship Online (OSO) is a powerful digital library developed by Oxford University Press, dedicated to the best academic monographs of Oxford University Press. All books in its collection have been written by world-class scholars, including Nobel laureates, and have been approved by 12 members of the Academic Council of the University of Oxford, with a high academic standard that can be trusted. Oxford Scholarship Online (OSO) currently has more than 20,000 books in more than 20 disciplines such as social sciences, humanities, natural sciences, and medicine. Our library purchased 8,544 books from OSO since before 2013.