Neylon, Cameron et al. "More readers in more places: the benefits of open access for scholarly books." Insights, 34(1), (2021).

This paper presents comparative findings drawn from samples of books published by Springer Nature, as part of exploring differences in usage patterns across open access (OA) and closed-access books. It is based on a study of 281 OA books and 3,653 closed-access books from stratified random samples.