Work on permissions as you write chapters as you will need to turn in a preliminary permissions log with draft chapters. Be as selective as possible with your inclusion of content from other sources. Third-party content should be used only when necessary as it’s often time-consuming and expensive to clear permissions to use this material.
As you incorporate third-party content into your manuscript, record the content and full source information on the permissions log. Once you've identified the third-party content, assess it to determine if permission is required. If permission is required, begin requesting as early as possible. When you finalize the permission agreement with the copyright holder, document the log and compile the agreements into the "permissions file."