Legal analysis: Subscription books are generally purchased by the subscribers themselves. If the husband entrusts his wife to sign, or after the husband ratifies, the wife's act of signing the subscription agreement is valid.

Legal basis: Article 165 of the Civil Code of People's Republic of China (PRC). Where the power of attorney entrusts an agent with written authorization, the power of attorney shall specify the name, agency matters, authority and time limit of the agent, and be signed or sealed by the principal.