The document discusses using altmetrics to measure the impact of scholarly works beyond citations. It defines altmetrics as alternative metrics that combine traditional citation counts with non-traditional measures capturing usage, captures, mentions, social media, and citations of research. The document provides examples of altmetrics that can be used to measure the impact of books, such as library holdings, Wikipedia references, reviews, readers, downloads, and social media mentions. It also discusses challenges in measuring the impact of books and the need to look at multiple metrics.