According to the enquiry of China Travel Service. Com, the standard for readers to pay overdue fees stipulated in Article 30 of the Beijing Library Regulations is: 0.2-0.5 yuan per day within 10 days after the specified date, and 0.5- 1 yuan per day after 10 days. Specific standards shall be formulated by the library according to the above standards and publicized to readers. So readers should return books on time.