In children's book publishing, a reference copy is a pre-production version of a book that is created for review purposes. This copy allows authors, illustrators, and publishers to assess the book's layout, images, typography, and content before moving to the final print stage. Reference copies are crucial for catching any last-minute errors or changes that need to be made, ensuring that the book meets quality standards and aligns with the original vision of the creators. It serves as an essential tool for feedback before wide distribution.