1. Title: Proof of not subscribing to books.

2. Text: State the reasons for not subscribing to books, such as economic status, health status, personal interests, etc.

For example, due to family financial difficulties, I decided not to subscribe to any books in order to allocate family expenses reasonably. Here, I promise to make full use of library resources and obtain learning materials through the Internet and e-books to meet my learning needs.

3. Ending: Write your own name and date, which will be signed by your parents for confirmation.

For example: my signature: (please sign)

Parent's signature: (Parents' signature please)

Date: (Please fill in the date)

4. Seal of the Academic Affairs Office of the school: if necessary, it can be stamped in the Academic Affairs Office of the school.

The above is the basic format of the open book certificate, which can be adjusted according to the actual situation. It is important to express that your decision is based on rational thinking and your own situation, and that you have other ways to acquire knowledge to avoid affecting your personal learning progress.