Sales figures in Author Hub are the total sales for your selected title. This means they reflect all sales of your title, both directly from Cambridge University Press & Assessment and those sold by Cambridge University Press & Assessment to retailers and third parties. 

• Sales figures include all formats, both print and digital. Digital sales include retail e-books (e.g., Amazon Kindle, ePub) and digital institutional copies (e.g., via Cambridge Core). 
• Sales figures exclude all gratis copies, such as author copies, publicity copies, inspection copies and so forth. 

Please note that some third-party retailers and accounts purchase via consignment meaning those sales will only appear in the following month or occasionally later.