24 hours Self-service book return (book drop) is located in front of the library for book that is not overdue.

• Only book that is borrowed from the Central Library is accepted.
• Only accept book that is one day before its due date.
• A book is considered ‘returned’ when it has been checked in and removed from your library account.
• Please check your personal library account at Web OPAC or at http://library.lib.ru.ac.th/patroninfo to ensure that the book has reached the library and has been checked in.
• Please notify the library if there is any problem or discrepancy.