At the current time, MassageBook does not integrate with Quickbooks. However, you can export any report to a CSV (spreadsheet) file which can be uploaded to Quickbooks.
1. Navigate to your Business tab.
2. Select Sales.
3. Choose the desired Report Name from the left side of the page.
4. Set the desired Date Range.
5. Select Export.
For information on uploading files to Quickbooks, view their tutorial here.